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Wordnet 3.0

NOUN (2)

1. a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium;
[syn: astatine, At, atomic number 85]

2. 100 at equal 1 kip in Laos;


The Collaborative International Dictionary of English v.0.48:

At \At\, prep. [AS. [ae]t; akin to OHG. az, Goth., OS., & Icel. at, Sw. [*a]t, Dan. & L. ad.] Primarily, this word expresses the relations of presence, nearness in place or time, or direction toward; as, at the ninth hour; at the house; to aim at a mark. It is less definite than in or on; at the house may be in or near the house. From this original import are derived all the various uses of at. It expresses: [1913 Webster] 1. A relation of proximity to, or of presence in or on, something; as, at the door; at your shop; at home; at school; at hand; at sea and on land. [1913 Webster] 2. The relation of some state or condition; as, at war; at peace; at ease; at your service; at fault; at liberty; at risk; at disadvantage. [1913 Webster] 3. The relation of some employment or action; occupied with; as, at engraving; at husbandry; at play; at work; at meat (eating); except at puns. [1913 Webster] 4. The relation of a point or position in a series, or of degree, rate, or value; as, with the thermometer at 80[deg]; goods sold at a cheap price; a country estimated at 10,000 square miles; life is short at the longest. [1913 Webster] 5. The relations of time, age, or order; as, at ten o'clock; at twenty-one; at once; at first. [1913 Webster] 6. The relations of source, occasion, reason, consequence, or effect; as, at the sight; at this news; merry at anything; at this declaration; at his command; to demand, require, receive, deserve, endure at your hands. [1913 Webster] 7. Relation of direction toward an object or end; as, look at it; to point at one; to aim at a mark; to throw, strike, shoot, wink, mock, laugh at any one. [1913 Webster] At all, At home, At large, At last, At length, At once, etc. See under All, Home, Large, Last (phrase and syn.), Length, Once, etc. At it, busily or actively engaged. At least. See Least and However. At one. See At one, in the Vocabulary. [1913 Webster] Syn: In, At. Usage: When reference to the interior of any place is made prominent in is used. It is used before the names of countries and cities (esp. large cities); as, we live in America, in New York, in the South. At is commonly employed before names of houses, institutions, villages, and small places; as, Milton was educated at Christ's College; money taken in at the Customhouse; I saw him at the jeweler's; we live at Beachville. At may be used before the name of a city when it is regarded as a mere point of locality. "An English king was crowned at Paris." --Macaulay. "Jean Jacques Rousseau was born at Geneva, June, 28, 1712." --J. Morley. In regard to time, we say at the hour, on the day, in the year; as, at 9 o'clock, on the morning of July 5th, in the year 1775. [1913 Webster]
WordNet (r) 3.0 (2006):

At n 1: a highly unstable radioactive element (the heaviest of the halogen series); a decay product of uranium and thorium [syn: astatine, At, atomic number 85] 2: 100 at equal 1 kip in Laos
V.E.R.A. -- Virtual Entity of Relevant Acronyms (September 2014):

AT Advanced Technology (IBM, PC)
The Free On-line Dictionary of Computing (18 March 2015):

at 1. commercial at. 2. The country code for Austria.
The Free On-line Dictionary of Computing (18 March 2015):

IBM PC AT AT PC AT ("Advanced Technology") A version of the IBM PC, released in Aug 1984 with an Intel 80286 processor, a 16-bit bus, a medium-speed hard disk and a 1.2 megabyte floppy disk drive. It had a larger case than the PC, which allowed it to accept "tall cards". The AT keyboard corrected the PC's non-standard placement of the return and left shift keys but shortened the backspace key, making it harder to reach. (1995-03-01)