AT
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At,
symbol for the element astatineastatine[Gr.,=unstable], semimetallic radioactive chemical element; symbol At; at. no. 85; at. wt. of most stable isotope 210; m.p. 302°C; (estimated); b.p. 337°C; (estimated); density unknown; valence believed to be +1, +3, +5, or +7.
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AT
Abbrev. for Australia Telescope.Collins Dictionary of Astronomy © Market House Books Ltd, 2006
at
(mechanics)
At
(chemistry)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
AT.
1. Abbr. for asphalt tile.
2. On drawings, abbr. for “airtight.”
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
at
a Laotian monetary unit worth one hundredth of a kip.
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
AT
(1)at
(character)at
(networking)The country code for Austria.
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AT
(1) See assistive technology.(2) (Advanced Technology) IBM's first 286-based PC, introduced in 1984. The PC AT featured a new keyboard, a higher-capacity 5.25" floppy (1.2MB) and a 16-bit data bus. AT-class machines ran considerably faster than the earlier 8088-based XT PCs. See 286 and AT bus.
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| IBM PC AT |
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| The fastest PC in 1984. Users were amazed at the extraordinary speed of the 286 with its huge 20MB hard disk. (Image courtesy of IBM.) |
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