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a-a

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a-a¹

noun

  1. alternative, uncountable Alternative 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.

a-a²

adjective

  1. abbreviation, not comparable Abbreviation of air-to-air

A-a³

Where it comes from

Initialism of alveolar and arterial.

adjective

  1. abbreviation, initialism, not comparable Initialism of alveolar-arterial A-a gradient

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MLA

"a-a." Wiktionary, via Micwyn, micwyn.com/word/a-a. Accessed 6 Nov. 2026.

APA

a-a. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/a-a

Chicago

"a-a." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/a-a.

BibTeX
@misc{a_a_2026,
  title = {a-a},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/a-a},
  urldate = {2026-11-06}
}