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A, first letter of the alphabet. A is a usual symbol for a low central vowel, as in father; the English long a (ā) is pronounced as a diphthong of ĕ and y. The corresponding letter of the Greek alphabet is named alpha. Alpha and omega, the last letter of the Greek alphabet, symbolize the beginning and the end and, in the New Testament, Christ. In musical notation the letter is the symbol of a note in the scale.
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McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
1. Abbr. for ampere, a unit of electric current.
2. Abbr. for area.
A unit of sound-level; a reading taken on the A-scale of a sound-level meter.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
the first in a series, esp the highest grade or mark, as in an examination
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005