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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 ?
Assigned AA rating to bonds of Nomura Real Estate Residential Fund
BANKING AND CREDIT NEWS-February 16, 2011--JCR assigns AA rating to bonds of Kansai International Airport(C)2011 M2 COMMUNICATIONS http://www.m2.com
M2 EQUITYBITES-November 10, 2011--Fitch sticks to AA rating of HSBC France(C)2011 M2 COMMUNICATIONS http://www.m2.com
BANKING AND CREDIT NEWS-November 18, 2011--Nippon Telegraph & Telephone gets AA rating from S&P for 10-year domestic bond(C)2011 M2 COMMUNICATIONS http://www.m2.com
5 December 2011 - DBRS on Friday gave an AA rating with a "stable" outlook to the CAD100m (USD98.4m/EUR73.2m) series E unsecured debentures of University of Toronto.
9 August 2010 - Indian rating agency CARE said on Friday it has assigned its AA rating to the lower tier 2 bonds of public-sector lender Punjab & Sind Bank.
The service also maintained the AA rating to the outstanding subordinated debt and preference shares of the firm.
M2 EQUITYBITES-December 20, 2010--Keio's shelf gets preliminary AA rating from JCR(C)2010 M2 COMMUNICATIONS http://www.m2.com
JCR reviewed the ratings on Keio Corporation and announced the affirmation of the AA/Stable and AA rating on senior debts and each series of its bonds on November 1, 2010.