(archaic, thieves' cant) The leader of a group of thieves.

Initialism of American academy of allergy, asthma, and immunology.

Initialism of American Academy of Arts and Sciences. / Initialism of American Academy of Asian Studies. / Initialism of American Association for the Advancement of Science.

Amateur Athletic Association of America / American Association for the Advancement of Agnosticism / American Association for the Advancement of Atheism / American Association for Affirmative Action

A specific size and configuration of electric battery. / (slang) A baseball player who is too good for Minor League Baseball, but not good enough for Major League Baseball.

present participle of aaah

(journalism) Initialism of Alliance for Audited Media. / (military) Initialism of air-to-air missile. / (sexuality) Initialism of adult-attracted minor (see usage notes on MAP).

plural of AAAA

Elongated form of agh.

(medicine) Initialism of abdominal aortic aneurysm. / (medicine) Initialism of acquired aplastic anemia. / (medicine) Initialism of acute anxiety attack. / (medicine) Initialism of amalgam.