Aa

//ˈɑː.ɑː// adj, name, noun, pron, verb

Definitions

Adjective
  1. 1
    Initialism of anti-aircraft or anti-air. abbreviation, alt-of, initialism, not-comparable
  2. 2
    Initialism of arctic-alpine. abbreviation, alt-of, initialism, not-comparable
  3. 3
    Abbreviation of ana (“of each, equal parts”). abbreviation, alt-of
  4. 4
    Initialism of air-to-air. abbreviation, alt-of, initialism, not-comparable
  5. 5
    Initialism of always afloat. abbreviation, alt-of, initialism, not-comparable
Show 4 more definitions
  1. 6
    Initialism of atlantoaxial. abbreviation, alt-of, initialism, not-comparable

    "AA joint; AA instability"

  2. 7
    Initialism of arterioarterial. abbreviation, alt-of, initialism, not-comparable

    "AA anastomosis"

  3. 8
    Initialism of Afro-Asiatic. abbreviation, alt-of, initialism, not-comparable
  4. 9
    Initialism of Austroasiatic. abbreviation, alt-of, initialism, not-comparable
Proper Noun
  1. 1
    Initialism of Alcoholics Anonymous: a self-supporting organization of alcoholic people. abbreviation, alt-of, initialism

    "She said, “I'm an alcoholic, just like my mother was. It's a struggle, but I haven't had a drink in a while.” That was something she hadn't meant to say, something she had never said outside of an AA meeting. But, after it had been said, it felt like as good a way to start as any."

  2. 2
    Several waterways in Europe.; A river in northern France, flowing 93 km from near Bourthes, Pas-de-Calais department into the North Sea near Gravelines, Nord department.
  3. 3
    Initialism of Academy Awards: a recognition of excellence in cinematic achievements, given annually by the Academy of Motion Picture Arts and Sciences. abbreviation, alt-of, initialism

    "Like a true AA follower (as in Academy Awards, not 12 steps), I never cared for Oscar parties. Somebody always talked through the songs or Vanessa Redgrave's speech or the costume parade, in which elegant runway models were forced to dress up as the farmers in Places in the Heart."

  4. 4
    Several waterways in Europe.; A small river in the Netherlands, flowing 72 km from near Nederweert, Limburg into the Dieze at 's-Hertogenbosch, North Brabant.
  5. 5
    Initialism of Addicts Anonymous. abbreviation, alt-of, initialism
Show 28 more definitions
  1. 6
    Several waterways in Europe.; A tributary of the Möhne river in North Rhine-Westphalia, Germany, part of the Rhine basin.
  2. 7
    Initialism of Al Ain. abbreviation, alt-of, initialism
  3. 8
    Several waterways in Europe.; A tributary of the Nether river in North Rhine-Westphalia, Germany, part of the Weser basin.
  4. 9
    Initialism of American Airlines: a major American airline headquartered in Fort Worth, Texas. abbreviation, alt-of, initialism

    "Alas, I fear, Netflix will soon break my heart. And it's an American icon that is warning me: American Airlines (AA). ¶ You see, middlemen are dying. Sabre, the former AA subsidiary that is now an independent global distribution system (GDS) supplying travel agencies and online travel agencies with ticket and pricing information, recently announced it was raising the rates it charges on AA tickets."

  5. 10
    Several waterways in Europe.; A tributary of the Werre river in North Rhine-Westphalia, Germany, part of the Weser basin.
  6. 11
    Initialism of Aerolíneas Argentinas. abbreviation, alt-of, initialism
  7. 12
    A village in Ida-Viru County, northern Estonia, on the Gulf of Finland.
  8. 13
    Initialism of Ansett Australia or Ansett Airways. abbreviation, alt-of, initialism
  9. 14
    A surname from Norwegian.
  10. 15
    Initialism of Air Almanac, a publication. abbreviation, alt-of, initialism
  11. 16
    Initialism of American Anthropologist: the flagship journal of the American Anthropological Association, founded in 1888. abbreviation, alt-of, initialism
  12. 17
    Initialism of Acta Astronautica: a scientific journal founded in 1955, covering fields related to the peaceful scientific exploration of space. abbreviation, alt-of, initialism
  13. 18
    Initialism of Aluminum America, a corporation. abbreviation, alt-of, initialism
  14. 19
    Initialism of The Aluminum Association: a trade association for the aluminum production, fabrication and recycling industries. abbreviation, alt-of, initialism
  15. 20
    Double-A: the second-highest level of play in Minor League Baseball after Triple-A (AAA). US
  16. 21
    Initialism of American Association: an American minor league baseball league from 1902 to 1962 and 1969 to 1997. US, abbreviation, alt-of, historical, initialism
  17. 22
    Initialism of The Automobile Association: a British motoring association founded in 1905. UK, abbreviation, alt-of, initialism

    "As we have said before, never accept an AA increase – if you phone up and threaten to leave they will, in our experience, drop it back to the previous price. Or better still, just keep switching provider each year. LV’s cover is a good alternative."

  18. 23
    Initialism of Alzheimer's Association: an American volunteer health organization focusing on care, support and research for Alzheimer's disease. abbreviation, alt-of, initialism
  19. 24
    Initialism of Amalgamated Association of Iron and Steel Workers. US, abbreviation, alt-of, historical, initialism

    "In the American steel industry, only two labor organizations were of any great significance in the late 19th and early 20th centuries. These were the Amalgamated Association of Iron, Steel and Tin Workers (The A.A.), and the Knights of Labor. The A.A. was formed in 1876 when the United Sons of Vulcan, composed of iron puddlers and boilers, joined forces with several smaller unions of rolling mill hands and other skilled iron workers."

  20. 25
    Initialism of Ann Arbor Railroad. US, abbreviation, alt-of, initialism
  21. 26
    Initialism of Arlington Annex. abbreviation, alt-of, initialism
  22. 27
    USPS military code of Armed Forces – Americas. US

    "• APO/FPO AE ZIPs 094-098 — Space Available Mail, Nov. 26; Parcel Airlift Mail, Dec. 3; Priority Mail, Dec. 10; First Class Mail Letters and Cards, Dec.10 and Express Mail Military Service, Dec. 18. • APO/FPO AA ZIP 340 — Space Available Mail, Nov. 26; Parcel Airlift Mail, Dec. 3; Priority Mail, Dec. 10; First Class Mail Letters and Cards, Dec. 10 and Express Mail Military Service, Dec. 18. • APO/FPO AP ZIPs 962-966 — Space Available Mail, Nov. 26; Parcel Airlift Mail, Dec. 3; Priority Mail, Dec. 10; First Class Mail Letters and Cards, Dec. 10 and Express Mail Military Service, Dec. 18."

  23. 28
    Initialism of Army Act. abbreviation, alt-of, initialism
  24. 29
    Initialism of aviatsionnaya Armiya. Russia, abbreviation, alt-of, dated, initialism
  25. 30
    Initialism of Antiproton Accumulator: an infrastructure connected to the Proton–Antiproton Collider at CERN. abbreviation, alt-of, initialism
  26. 31
    Alternative form of A∴A∴. alt-of, alternative

    "In Magic in Theory and Practice, Crowley explains his other Order, the Silver Star (Argentinum Astrum), which certainly does have such a degree. The AA is a totally secret occult organization in which any member should know only the person who initiated him or her and those whom he or she has initiated."

  27. 32
    Initialism of Anna's Archive. abbreviation, alt-of, initialism

    "This specific paper isn't available on AA, but to whom it may intrigue I think this works: […]"

  28. 33
    Abbreviation of Alcoa. abbreviation, alt-of

    "Similarly, Alcoa (AA)CEO Klaus Kleinfeld has also dropped plans to attend, but the company will participate, said spokeswoman Monica Orbe."

Noun
  1. 1
    A member of Alcoholics Anonymous. countable, uncountable

    "In a letter to Cohen, written between 1956 and 1961, he reported hearing gossip about his LSD use in AA circles. He reminded Cohen about "the desirability" of omitting his name "when discussing LSD with AAs". Cohen reassured Wilson that his LSD trials did not include other active AA members."

  2. 2
    A form of lava flow associated with Hawaiian-type volcanoes, consisting of basaltic rock, usually dark-colored with a jagged and loose, clinkery surface. Compare pahoehoe. uncountable

    "We...saw ‘pahoihoi’ or solid lava forming, and also ‘aa’ or clinkers."

  3. 3
    Initialism of acetic acid. abbreviation, alt-of, initialism
  4. 4
    Abbreviation of adjectives. abbreviation, alt-of, plural, plural-only
  5. 5
    an associate degree in arts wordnet
Show 85 more definitions
  1. 6
    An AA battery (energy-storage device). countable, uncountable

    "Whether your camera takes AAs or a unique, proprietary battery, you should always have a spare. […] You will not be able to walk into a local supermarket and buy a new one as you can with AAs."

  2. 7
    Initialism of acting age. abbreviation, alt-of, initialism
  3. 8
    Abbreviation of arteries. abbreviation, alt-of, plural, plural-only
  4. 9
    an international organization that provides a support group for persons trying to overcome alcoholism wordnet
  5. 10
    Initialism of affirmative action. abbreviation, alt-of, countable, initialism, uncountable

    "Some of the rules guiding these nominations are affirmative action (AA)¹ policies intended to increase the influence of and to encourage nomination of women and minorities. […] A review of the extant literature on AA and its effect on decision-makers produces competing hypotheses about the potential impact on female candidates seeking party nomination."

  6. 11
    Initialism of alveolar-arterial. abbreviation, alt-of, initialism
  7. 12
    a dry form of lava resembling clinkers wordnet
  8. 13
    Initialism of air armament. abbreviation, alt-of, countable, initialism, uncountable
  9. 14
    Initialism of aminoacetone. abbreviation, alt-of, initialism
  10. 15
    Initialism of air attaché. abbreviation, alt-of, countable, initialism, uncountable
  11. 16
    Initialism of amino acid. abbreviation, alt-of, initialism
  12. 17
    Initialism of aircraft apprentice. abbreviation, alt-of, countable, initialism, uncountable
  13. 18
    Initialism of approximate absolute. abbreviation, alt-of, initialism
  14. 19
    Initialism of aircraft artificer. abbreviation, alt-of, countable, initialism, uncountable
  15. 20
    Initialism of arachidonic acid. abbreviation, alt-of, initialism
  16. 21
    Initialism of absolute altitude. abbreviation, alt-of, countable, initialism, uncountable
  17. 22
    Initialism of armature accelerator. abbreviation, alt-of, initialism
  18. 23
    Initialism of anti-aircraft. abbreviation, alt-of, countable, initialism, uncountable

    "They're setting up an AA battery. That thing'll tear the Dawn apart... We'll wait for you to take the shot."

  19. 24
    Initialism of ascending aorta. abbreviation, alt-of, initialism
  20. 25
    Initialism of avenue of approach. abbreviation, alt-of, countable, initialism, uncountable
  21. 26
    Initialism of atomic absorption. abbreviation, alt-of, initialism
  22. 27
    Initialism of assembly area. abbreviation, alt-of, countable, initialism, uncountable
  23. 28
    Initialism of author's alteration. abbreviation, alt-of, initialism
  24. 29
    Initialism of airman apprentice. abbreviation, alt-of, countable, initialism, uncountable
  25. 30
    Initialism of average audience. abbreviation, alt-of, initialism
  26. 31
    Initialism of absolute alcohol. abbreviation, alt-of, countable, initialism, uncountable
  27. 32
    Initialism of achievement age. abbreviation, alt-of, countable, initialism, uncountable
  28. 33
    Initialism of acting appointment. abbreviation, alt-of, countable, initialism, uncountable
  29. 34
    Initialism of adoption agency. abbreviation, alt-of, countable, initialism, uncountable
  30. 35
    Initialism of armament artificer. abbreviation, alt-of, countable, initialism, uncountable
  31. 36
    Initialism of athletic association. abbreviation, alt-of, countable, initialism, uncountable
  32. 37
    Initialism of author's alteration. abbreviation, alt-of, countable, initialism, uncountable
  33. 38
    Initialism of aviation annex. abbreviation, alt-of, countable, initialism, uncountable
  34. 39
    Initialism of angular aperture. abbreviation, alt-of, countable, initialism, uncountable
  35. 40
    Initialism of amino acid. abbreviation, alt-of, countable, initialism, uncountable

    "All proteinogenic amino acids (AAs) are claimed to be levorotatory (L-configured). Nevertheless, dextrorotatory AAs (D-configured) are also found in nature (Gao et al., 2015; Ollivaux et al., 2014), for example, in the organic material of extraterrestrial comets (Cronin and Pizzarello, 1983), or, formed by slow racemization, in all dead biological material."

  36. 41
    Initialism of aminoacyl. abbreviation, alt-of, countable, initialism, uncountable
  37. 42
    Initialism of acetic acid. abbreviation, alt-of, countable, initialism, uncountable
  38. 43
    Initialism of acrylic acid. abbreviation, alt-of, countable, initialism, uncountable

    "For copolymers of ethylene, the other comonomer can be an alkene such as propene, butene, hexene or octene, or a compound having a polar functional group such as vinyl acetate (VA), acrylic acid (AA), ethyl acetate (EA), methyl acrylate (MA) or vinyl alcohol (VOH)."

  39. 44
    Initialism of amyloid A. abbreviation, alt-of, countable, initialism, uncountable
  40. 45
    Initialism of arachidonic acid. abbreviation, alt-of, countable, initialism, uncountable

    "Arachidonic acid (AA) is present at unusually high levels in the phospholipids of inflammatory cells. […] IgG-mediated phagocytosis results in the preferential release of AA over other fatty acids²³ via activation of cPLA₂ and iPLA₂."

  41. 46
    Initialism of ascorbic acid. abbreviation, alt-of, countable, initialism, uncountable
  42. 47
    Initialism of asymmetric aminohydroxylation. abbreviation, alt-of, countable, initialism, uncountable
  43. 48
    Initialism of acetaldehyde adduct. abbreviation, alt-of, countable, initialism, uncountable

    "The two tests presently in this category are the blood tests carbohydrate deficient transferrin (CDT) and hemoglobin or whole blood acetaldehyde adducts (AA). […] Measurement of AA in the blood has also generated a great deal of recent research interest."

  44. 49
    Initialism of adrenal androgen. abbreviation, alt-of, countable, initialism, uncountable

    "Although the ovaries are the main source of androgen excess in PCOS, excess adrenal androgen (AA) levels (e.g., dehydroepiandrosterone [DHEA] and adrenal-secreted androsteredione [A4]) and adrenocortical dysfunction have also been observed in many patients with PCOS (2–6). Proof of the role of AA excess in the development of PCOS is circumstantial at best."

  45. 50
    Initialism of antiandrogen. abbreviation, alt-of, countable, initialism, uncountable
  46. 51
    Initialism of antioxidant activity. abbreviation, alt-of, countable, initialism, uncountable

    "Antioxidant activity (AA) is one of the main and most acclaimed properties of edible oil, and the antioxidant properties of EVOO have been extensively highlighted (Tuck and Hayball, 2002; Vissers et al., 2004). AA is usually estimated by monitoring the scavenging of a free radical by antioxidants that lead to either the inhibition of a chemical reaction or the changes of reaction rate constants in an ongoing radical reaction."

  47. 52
    Initialism of atomic absorption. abbreviation, alt-of, countable, initialism, uncountable
  48. 53
    Initialism of activated alumina. abbreviation, alt-of, countable, initialism, uncountable

    "Activated alumina (AA, or γ-Al₂O₃) is an amorphous aluminium oxide prepared by dehydrating Al(OH)₃ at high temperature, […] Arsenic removal on AA is strongly pH-dependent, and is optimal between pH 5.5 and 6.0, which often requires acidification, and subsequent neutralisation to prevent corrosion."

  49. 54
    Initialism of anti-antibody. abbreviation, alt-of, countable, initialism, uncountable
  50. 55
    Initialism of ascending aorta. abbreviation, alt-of, countable, initialism, uncountable
  51. 56
    Initialism of abdominal aorta. abbreviation, alt-of, countable, initialism, uncountable
  52. 57
    Initialism of aortic arch. abbreviation, alt-of, countable, initialism, uncountable
  53. 58
    Initialism of acute appendicitis. abbreviation, alt-of, countable, initialism, uncountable
  54. 59
    Initialism of allergic asthma. abbreviation, alt-of, countable, initialism, uncountable
  55. 60
    Initialism of alopecia areata. abbreviation, alt-of, countable, initialism, uncountable

    "The existence of many autoimmune concurrent diseases supports that AA is an autoimmune disease. […] The incidence of type I diabetes in AA is intriguing; it is decreased in AA patients and increased in their relatives."

  56. 61
    Initialism of anaplastic astrocytoma. abbreviation, alt-of, countable, initialism, uncountable
  57. 62
    Initialism of anastomotic aneurysm. abbreviation, alt-of, countable, initialism, uncountable

    "An anastomotic aneurysm (AA) is an aneurysm that occurs at an anastomotic interface between a graft and an artery. […] Recently, it has been recognized that an increasing number of AAs may in fact be true aneurysms occurring at the junction of a prosthetic graft and an artery."

  58. 63
    Initialism of aortic aneurysm. abbreviation, alt-of, countable, initialism, uncountable

    "This issue of Circulation has an interesting contribution from Reed et al,¹ who advance the point of view that aortic aneurysms (AAs) are “caused” by atherosclerosis. […] The authors propose two arguments in support of a “causal” relation between atherosclerotic risk factors and the development of AAs."

  59. 64
    Initialism of aplastic anemia. abbreviation, alt-of, countable, initialism, uncountable

    "Aplastic anemia (AA) secondary to radiotherapy presents a difficult situation in the treatment of both the malignant tumor and AA itself. We aimed to evaluate the efficacy of avatrombopag (AVA), a thrombopoietin receptor agonist, in patients with AA secondary to chemoradiotherapy."

  60. 65
    Initialism of arterial aneurysm. abbreviation, alt-of, countable, initialism, uncountable

    "Arterial aneurysms (AA) are local out-pouching of a blood vessel wall. […] According to the statistics, 90% of all AA are located in the anterior segments of the circle of Willis and only 10% in the posterior segments (Dandy 1944; Zlotnik 1967)."

  61. 66
    Initialism of arytenoid adduction. abbreviation, alt-of, countable, initialism, uncountable

    "If the paralysis is unilateral, arytenoid adduction (AA) procedures can be done to medialize the complex and arguably improve the results of an implant medialization.⁷⁹ An AA arytenopexy can reconfigure the ipsilateral arytenoid for improved glottic closure, if needed.^(1,80)"

  62. 67
    Initialism of anesthesiologist assistant. abbreviation, alt-of, countable, initialism, uncountable
  63. 68
    Initialism of anesthesia assistant. abbreviation, alt-of, countable, initialism, uncountable
  64. 69
    Initialism of antialiasing. abbreviation, alt-of, countable, initialism, uncountable
  65. 70
    Initialism of African-American. abbreviation, alt-of, countable, initialism, uncountable

    "For example, among AAs “spell” refers to a trance state in which individuals can communicate with deceased relatives and which is associated with brief periods of personality change (American Psychiatric Association 1994)."

  66. 71
    Initialism of Asian-African. abbreviation, alt-of, countable, initialism, uncountable
  67. 72
    Initialism of Asian American. abbreviation, alt-of, countable, initialism, uncountable

    "Asian Americans (AAs) constitute the fastest growing group in the United States, yet health promotion in this population is severely hampered by its invisibility in the U.S. population. […] This chapter will address each of the four factors that contribute to the lack of knowledge and health information about AAs."

  68. 73
    Initialism of administrative assistant. US, abbreviation, alt-of, countable, initialism, uncountable

    "But Wilson's loyal administrative assistant, Charlie Simpson, felt that he couldn't put up with it anymore. […] “I have to learn how to be a congressman and you need to learn how to be an AA [administrative assistant],” Wilson had told Simpson. “And this is the first thing we have to do.” […] The experience left the AA believing that perhaps the two of them shared a special destiny."

  69. 74
    Initialism of associate administrator. abbreviation, alt-of, countable, initialism, uncountable

    "I've worked at NASA as a graduate student working as a summer intern, and as an AA. Those are two of the most valuable experiences in my life."

  70. 75
    Initialism of assistant adjutant. abbreviation, alt-of, countable, initialism, uncountable
  71. 76
    Initialism of academic adviser. abbreviation, alt-of, countable, initialism, uncountable

    "The AA said that given my background in English studies and applied linguistics, my introductory course in phonetics would be waved. Three of the four courses the AA prescribed included computer assisted instruction, which I eventually dropped due to overload, English language teaching methodology and psychology of second language learning."

  72. 77
    Initialism of Associate in Arts or Associate of Arts. abbreviation, alt-of, countable, initialism, uncountable

    "“I’m still figuring out my plans, but going back for another year is in my plans. I would be going back and getting my AA [degree], while playing another year of softball,” Enright said."

  73. 78
    Initialism of appropriate authority. abbreviation, alt-of, countable, initialism, uncountable
  74. 79
    Initialism of appropriate adult. British, English, abbreviation, alt-of, countable, initialism, uncountable

    "An AA, who was a trained social worker, also felt that the volunteer AAs should be shown greater respect by the police (GMS14). At the same time, there was some awareness that AAs were unpaid among the private police staff, as one commented that she tried to be particularly nice to the AAs because of their volunteer status (e.g. SNS7)."

  75. 80
    Initialism of account aggregator. abbreviation, alt-of, countable, initialism, uncountable

    "The RBI had in 2016 approved a new class of NBFCs to act as account aggregators (AA). These AAs will play the role of providing services based on the explicit consent of individual clients."

  76. 81
    Initialism of appointed actuary. abbreviation, alt-of, countable, initialism, uncountable

    "Appointed Actuaries (AAs) are entrusted with the responsibility of maintaining solvency position of the Company. […] However, the existing arrangements of AAs and Mentors not complying with these guidelines may continue till June 30."

  77. 82
    Initialism of approximate absolute. abbreviation, alt-of, countable, initialism, uncountable
  78. 83
    Initialism of arithmetic average. abbreviation, alt-of, countable, initialism, uncountable
  79. 84
    Initialism of Association Agreement: a treaty between the European Union, its member states and a non-EU country that creates a framework for cooperation between them. abbreviation, alt-of, countable, initialism, uncountable

    "Following the AA's enactment in June 2004, some institutional reform took place with the aim of enhancing the competitiveness of Egyptian products. […] The AA reflected a long-term and a rather broadly defined consideration of economic and social development and the process of market transformation in Egypt."

  80. 85
    Initialism of against actual. abbreviation, alt-of, countable, initialism, uncountable
  81. 86
    Initialism of approach anxiety. abbreviation, alt-of, countable, initialism, uncountable
  82. 87
    Initialism of agent assistant; an assistant of a real estate agent. Hong-Kong, abbreviation, alt-of, countable, initialism, uncountable
  83. 88
    Initialism of annual allowance. UK, abbreviation, alt-of, countable, initialism, uncountable
  84. 89
    Abbreviation of all-around. abbreviation, alt-of, countable, uncountable
  85. 90
    Initialism of average audience. abbreviation, alt-of, countable, initialism, uncountable
Pronoun
  1. 1
    I. Northumbria, personal
Verb
  1. 1
    Initialism of antialias. abbreviation, alt-of, initialism, transitive

    "On the other hand, edge AA in EF2000 didn't make much difference because only the objects were AAed and they made up only a very small percentage of the screen area."

Etymology

Etymology 1

Abbreviations.

Etymology 2

Abbreviations.

Etymology 3

Abbreviations.

Etymology 4

Abbreviations.

Etymology 5

From Hawaiian ʻaʻā.

Etymology 6

Abbreviation.

Etymology 7

Abbreviation.

Etymology 8

Compare pp.

Etymology 9

Contraction.

Etymology 10

The river names are ostensibly from Proto-West Germanic *ahu (“river”).

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