a|a

a|a «AH ah», noun.

lava hardened into a rough, slaggy, brittle mass.

╂[< Hawaiian 'a'a]

AA (no periods),

an abbreviation or symbol for the following:

1. achievement age.

2. air-to-air.

3. antiaircraft.

4. author's alteration.

5. (in financial rating) the second highest rank.

6. the second in a series of narrow shoe widths (followed in degree of narrowness by AAA).

A.A.,

an abbreviation for the following:

1. Alcoholics Anonymous.

2. antiaircraft.

3. Associate in Arts.

4. Automobile Association (of Great Britain).