a

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Related to Aurons: aurous

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
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