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A,

first letter of the alphabetalphabet
[Gr. alpha-beta, like Eng. ABC], system of writing, theoretically having a one-for-one relation between character (or letter) and phoneme (see phonetics). Few alphabets have achieved the ideal exactness.
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. 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 notationmusical notation,
symbols used to make a written record of musical sounds.

Two different systems of letters were used to write down the instrumental and the vocal music of ancient Greece. In his five textbooks on music theory Boethius (c.A.D. 470–A.D.
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 the letter is the symbol of a note in the scale.

a

(electricity)
(physics)

A

(electricity)
(mechanics)

Å

(mechanics)

A

1. Abbr. for ampere, a unit of electric current.
2. Abbr. for area.

dB(A)

A unit of sound-level; a reading taken on the A-scale of a sound-level meter.

a

, A
the first in a series, esp the highest grade or mark, as in an examination
References in periodicals archive ?
a) Toxin Shift Subconductance Longer mean modification activation states (b) open time Natural toxins Yes Yes (1) Yes Modified A-ring Yes No No Open A-ring Yes Yes (4) Yes Short spacer region Yes No No Bulky side chain Yes No No Saturated H-ring No (c) No No Brevenal ND ND ND Toxin Inhibit Toxin modification inactivation antagonist Natural toxins Yes No Modified A-ring Yes No Open A-ring Yes No Short spacer region No No Bulky side chain No Yes Saturated H-ring No No Brevenal ND Yes ND, not determined.
5 [Angstrom] separation from the A-ring H-bond acceptor site), which is consistent with lack of reported agonist properties.
He believes that if the airliner had not hit the light poles, it would have slammed into the Pentagon's 9th and 10th corridor A-ring, and the loss of life would have been greater.