aa

noun

1. basaltic lava having a rough surface.

1. administrative assistant.
2. Alcoholics Anonymous.
3. antiaircraft.
4. author’s alteration.

Symbol.

1. a proportional shoe width size, narrower than A and wider than AAA.
2. the smallest proportional brassiere cup size.
3. a quality rating for a corporate or municipal bond, lower than AAA and higher than A.
4. Electricity. a battery size for 1.5 volt dry cells: diameter, 0.6 inches (1.4 cm); length, 2 inches (5 cm).
5. British. a designation for motion pictures certified as unsuitable for children under 14 unless accompanied by an adult.Compare A(def 11), U(def 6), X(def 9).

Symbol.

1. (in prescriptions) ana².

1. author’s alteration.

1. Alcoholics Anonymous.
2. antiaircraft.
3. antiaircraft artillery.
4. Associate in Accounting.
5. Associate of Arts.
6. author’s alteration.

noun

1. a volcanic rock consisting of angular blocks of lava with a very rough surface

abbreviation for

1. ana 1

abbreviation for

1. Alcoholics Anonymous
2. anti-aircraft
3. Architectural Association
4. (in Britain) Automobile Association
5. (in Britain) Advertising Association

symbol for

6. (in Britain, formerly) a film that may not be shown publicly to a child under fourteen

also AA, abbreviation of Alcoholics Anonymous, attested by 1941, American English. The group name was the title of a book published in 1938 by the founder, Bill W.

abbr.

1. Alcoholics Anonymous
2. amino acid
3. aminoacyl

1. A type of lava having a rough, jagged surface. It is relatively slow moving in its molten state, advancing in the form of massive blocks with fissured and angular surfaces that ride on a viscous interior. The blocks range in size between the size of a football and the size of a house. See Note at pahoehoe.