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A, a

[ey]
–noun, plural A's or As, a's or as.
1. the first letter of the English alphabet, a vowel.
2. any spoken sound represented by the letter A or a, as in bake, hat, father, or small.
3. something having the shape of an A.
4. a written or printed representation of the letter A or a.
5. a device, as a printer's type, for reproducing the letter A or a.
6. from A to Z, from beginning to end; thoroughly; completely: He knows the Bible from A to Z.
7. not know from A to B, to know nothing; be ignorant.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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a 1 or A   (ā)   
n.   pl. a's or A's also as or As
  1. The first letter of the modern English alphabet.

  2. Any of the speech sounds represented by the letter a.

  3. The first in a series.

  4. Something shaped like the letter A.

  5. A The best or highest in quality or rank: grade A milk.

  6. Music

    1. The sixth tone in the scale of C major or the first tone in the relative minor scale.

    2. A key or scale in which A is the tonic.

    3. A written or printed note representing this tone.

    4. A string, key, or pipe tuned to the pitch of this tone.

  7. A One of the four major blood groups in the ABO system. Individuals with this blood group have the A antigen on the surface of their red blood cells, and the anti-B antibody in their blood serum.

The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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