Definition of aa

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AA 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 *Supplemental Details:*Sponsor an extended definition for AA for as little as $10 per month. Click here to contact us.

aa noun (alternative spelling of, Ê»aÊ»Ä) 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. *Supplemental Details:*Sponsor an extended definition for aa for as little as $10 per month. Click here to contact us.

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