aa
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or a'a (ä'ä) 
n.
Lava having a rough surface.
n.
Lava having a rough surface.
[Hawaiian 'a'ā, to burn, aa.]
(1) (Auto Answer) See modem.
(2) (Double A) A common single-cell battery used in a myriad of devices from flashlights to electronic equipment of all variety. Like its triple A (AAA) cousin, it provides 1.5 volts of DC power. When used in series, the voltage is multiplied. For example, four AA batteries yield 6 volts.
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categories related to 'aa'
- Publishing - aa: designation for author’s alterations on galley proofs, for which compositor must be paid
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