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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) (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 ?
This ancestral context is but one of many that A'a has had over time.
A'a Gulo, a staff member at the Nias coordinating post for natural disaster, told Kyodo News from the island town of Gunung Sitoli that most of the dead are from the village of Lahusa, the hardest-hit area.
Notice the complementary ranges A'A and CC' wherein metaeconomics suggests that it may be in the self-interest to pursue the we-interest (in A'A), and that it may be in the we-interest to pursue the self-interest (in CC').
A'a has a surface that's broken into blocks with sharp, spiny projections.
Les mots a'a gboo et a yee gboo sont le plus souvent les termes exacts pour arriere-grand-mere et arriere-grand-pere mais il peuvent aussi indiquer des ancetres plus eloignes; il faut demander aux informateurs de preciser.
015 in radian, then A'A = A'A=R [multiplied by] [delta (difference)][theta], therefore,
Nor was he simply borrowing exotic forms, as Victor Brauner did in an awful 1934 canvas which takes over a frightening image of the God A'a from the Austral Islands.
SANA'A, May 13 (Saba) A'A Yemeni delegation take parts in the first forum on economy and cooperation between Saudi Arabia, Azerbaijan and Central Asia countries, to be held in Riyadh on May 13, 2014.
Wabtec predicts the deals to boost its earnings in the first year after A'A the completion of the transactions.
A'a think a'ad better slow doon a bit, foget the future, just let it happen, stop chewin' the fat