Astronomy

//əˈstɹɑn.ə.mi// noun

noun ·Moderate ·High school level

Definitions

Noun
  1. 1
    The study of the physical universe beyond the Earth's atmosphere, including the process of mapping locations and properties of the matter and radiation in the universe. uncountable, usually

    "The fact is, dark energy is the biggest mystery in science. It has driven a huge amount of research in the past decade, and was a key driver in last year’s “New Worlds, New Horizons” report from the National Academies of Science, which prioritized future astronomy and astrophysics projects."

  2. 2
    the branch of physics that studies celestial bodies and the universe as a whole wordnet
  3. 3
    Astrology. obsolete, uncountable, usually

    "Not from the stars do I my judgment pluck; And yet methinks I have astronomy […]"

Synonyms

All synonyms
stargazingastrogeologyastrognosyastrographyastrolithologyastrophotography

Example

More examples

"Maya priests learned much about astronomy."

Etymology

From Middle English astronomie, astronemy, from Old French astronomie, equivalent to astro- + -nomy. Displaced native Old English tungolcræft.

Related phrases

science subjectspace sciencestar gazingstar sciencestar studystar studyingstudy stars

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