A-a

adj, noun

adj, noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    Alternative form of aa. alt-of, alternative, uncountable

    "The second form of the lavas is called by the natives a-a, and its contrast with pahoehoe is about the greatest imaginable. It consists mainly of clinkers sometimes detached, sometimes partially agglutinated together with a bristling array of sharp, jagged, angular fragments."

Adjective
  1. 1
    Abbreviation of air-to-air. abbreviation, alt-of, not-comparable
  2. 2
    Initialism of alveolar-arterial. abbreviation, alt-of, initialism, not-comparable

    "A-a gradient"

Synonyms

All synonyms
alveoloarterial

Example

More examples

"The second form of the lavas is called by the natives a-a, and its contrast with pahoehoe is about the greatest imaginable. It consists mainly of clinkers sometimes detached, sometimes partially agglutinated together with a bristling array of sharp, jagged, angular fragments."

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.