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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)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

AA

Abbr. for the “Architectural Association, ” the largest school of architecture in England; address 34–36 Bedford Square, London, WC1B 3ES.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

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.
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References in periodicals archive ?
This ancestral context is but one of many that A'a has had over time.
Even the nastiest 'a'a flows began to invoke a pleasurable mindfulness from the heightened level of concentration necessary to safely pass through their clutches.
Boroujerdi highlighted the necessity of helping the Syrian people and offering humanitarian aid to them saying, "Work must be done to find means that prevent the violation of human rights in Syria by the armed terrorist groups."A'A'A'A'A'A'A'A' Syria: Unified efforts needed to halt cancerous growth of terrorism Chairperson of the Arab and Foreign Affairs Committee at the People's Assembly Fadia Deeb said that from the beginning Syria has warned against the spread of terrorism, and terrorism has actually begun to cross borders and kill the innocents, citing what is taking place in Ukraine, Iraq, Yemen, Egypt, Turkey, Libya and Lebanon.
Summary: ISTANBUL A'A'" Riot police with water cannons and tear gas are hitting protesters who remain defiant after authorities evicted activists from an Istanbul park.
"Moreover, this will be a good opportunity for people to buy their own and local domains, especially with unique Arabic letters that are not available in English such as dh, kh and a'a.
Or the Big Island--losing myself in the volcanoes, looking for where the earth bleeds fire between patches of pahoehoe and a'a lava formations.
A'[A'.sup.2.sub.1] - [A.sub.l][A'.sup.2.sub.1] = (A'A - [A'.sub.1]E)[sup.2] + A[F.sup.2] + E[F.sup.2] - [A.sub.l][A'.sup.2.sub.1].
"The smoother rock," Mark told the boys earlier in his penetrating voice, using the Hawaiian terms and pronunciation, "is Pahoehoe, and the sharper, jagged stuff is A'a. The difference is a function of mineral content and how quickly the lava cooled."
Analysts termed the agreement A'a win win solution' for both parties.