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Aa

(ä) [from a word for "water" of the same Indo-European root as Lat. aqua], name of many small streams of N Europe and Switzerland. Aa, or a derivative of it, is a component part of hundreds of European place names.

aa

(ä`ä): see lavalava
, molten rock that erupts on the earth's surface, either on land or under the ocean, by a volcano or through a fissure. It solidifies into igneous rock that is also called lava.
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aA

(electricity)

AA

(ordnance)

AA

Abbr. for the “Architectural Association, ” the largest school of architecture in England; address 34–36 Bedford Square, London, WC1B 3ES.

AA

(1) (Auto Answer) See modem.

(2) A telephone answering system with voice prompts. See automated attendant.

(3) (Double A) A common single-cell battery used in myriad 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.
References in periodicals archive ?
Finally, the bill authorizes anesthesiologist assistants, an extender position similar to physician assistants, to work in Indiana.
National Commission for Certification of Anesthesiologist Assistants
That same year, Louisiana took the opposite position by banning anesthesiologist assistants from practice in the state.
Another option to reduce the shortage, Roman said, would be to use anesthesiologist assistants, which have been used in other states.