aa: Meaning and Definition of

a•a

1. basaltic lava having a rough surface.

AA

1. See
2. See
3. antiaircraft.
4. See

AA

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. a battery size for 1.5 volt dry cells: diameter, 0.6 in. (1.4 cm); length, 2 in. (5 cm).
5. a designation for motion pictures certified as unsuitable for children under 14 unless accompanied by an adult. Cf. A (def. 11),(def. 5),(def. 9).

aa

1. (in prescriptions) ana.

A.A.

1. See
2. antiaircraft.
3. antiaircraft artillery.
4. Associate in Accounting.
5. See
6. See

a.a.

1. See