| Definitions | | AA |
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initialism
- Automobile Association
- Alcoholics Anonymous
- American Airlines
- A.A. (or A.'.A.'.) Esoteric Magickal order Astrum Argenteum, or Silver star, a magickal order.
- Antiaircraft
- Alzheimer's Association
- Armed Forces Americas (USPS abbreviation code)
- Affirmative Action
- African-American
- (chemistry): amino acid
- (military) assembly area
- (military) avenue of approach
- (poker) A starting hand in Texas hold 'em comprised of two aces
Translations: - Dutch: ANWB (Netherlands); Touring, VTB-VAB (Belgium)
- German: ADAC
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noun
- (alternative spelling of, ʻaʻ�) A form of lava flow associated with Hawaiian-type volcanoes, consisting of basaltic rock, usually dark-colored with a jagged and loose, clinkery surface. Compare pahoehoe.
- Quotations
- 1859 - R. C. Haskell in American journal of science and arts, series XXVIII
- : We...saw "pahoihoi" or solid lava forming, and also "" or clinkers.
- 1883 - Clarence E. Dutton in the fourth Annual report of the United States Geological Survey
- : 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.
- 1944' - Charles A. Cotton: Volcanoes as landscape forms''
- : Cooling and solidification frequently takes a different course...in lava flows, producing the clinker-like "" lava.
Translations: Etymology: From Hawaiian ÊaÊÄ.
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