A.u.

noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    Abbreviation of atomic units. abbreviation, alt-of
  2. 2
    Alternative form of AU. alt-of, alternative
  3. 3
    Abbreviation of arbitrary units. abbreviation, alt-of
  4. 4
    Abbreviation of astronomical units. abbreviation, alt-of
  5. 5
    Abbreviation of absorbance units. abbreviation, alt-of

Synonyms

All synonyms
astronomical unit

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