plural of AA

(anthropology) Initialism of Australian Anthropological Society. / (arachnology) Initialism of American Arachnological Society (a society of amateur and professional arachnologists)

(aviation) Initialism of Advanced Automation System. (radar control of transoceanic air corridors) / (geometry) Initialism of angle-angle-side triangular congruency.

A village in southwest France, in the Ossau valley of the Pyrenees. / A surname from Norwegian.

Initialism of Alcoholics Anonymous; also A.A.: a self-supporting organization of alcoholic people.

(computer graphics, transitive) To antialias.

(military, aviation) Initialism of anti-aircraft and anti-air; also a/a, A-A, A/A. / (military, aviation) Initialism of air-to-air. / (anatomy, medicine) Initialism of atlantoaxial.

A member of Alcoholics Anonymous. / An AA battery (energy-storage device). / Initialism of affirmative action. / Initialism of air armament. / Initialism of air attaché.

Initialism of acetic acid. / Initialism of acting age. / (medicine) Initialism of alveolar-arterial. / Initialism of aminoacetone. / Initialism of amino acid. / Initialism of approximate absolute.

Abbreviation of ana (“of each, equal parts”).