a-a

A form of aa — A member of Alcoholics Anonymous.

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Meanings

a-a1

nouna-a (uncountable)
  1. alternativeuncountableAlternative form of aa.

    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.

    1883, Clarence E. Dutton, Fourth Annual report of the United States Geological Survey

a-a2

adjectivea-a (not comparable)
  1. abbreviationnot comparableAbbreviation of air-to-air.

A-a3

adjectiveA-a (not comparable)
  1. abbreviationinitialismnot comparablemedicineInitialism of alveolar-arterial.

    A-a gradient

Synonyms & antonyms

Also see
alveoloarterial

Origin

Initialism of alveolar and arterial.

Full word history & related roots →
Cite this entry
APA

a-a. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/a-a

MLA

“a-a.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/a-a. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “a-a,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/a-a.

Source: a-a on Wiktionary, CC BY-SA 4.0.