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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 ?
Big A's Place has the professional sandblaster covered from head to foot with safety equipment, including helmets by Nova and Sandblaster Astro Style, hoods, and other gear.
Currently the Giants and A's share the two-team Bay Area market in terms of television, radio, sponsors and fans.
The Lancaster A's then lost 3-2 to the Orioles, before bouncing back with a come-from-behind 5-4 victory over the Harvard Athletics.
Working in a comparatively small city and saddled with a lousy stadium, the A's were financially desperate enough to consider radical measures for finding quality players grossly undervalued by the market.
The Three A's Pertemps staff of 24 cover training in around 20 occupations.
The addition of a mulching unit will turn A & A's waste wood into fuel for E.
The network will air two specials celebrating the A's deep ties to the Bay Area as part of the re-launch as Comcast SportsNet Bay Area: A's in Japan and Oakland Athletics: 40 Year of Champions.
After all, this is baseball, in which unforeseen developments unfold on a regular basis, in which an Oliver Perez can't pitching effectively throughout the regular season and becomes exceptional during the playoffs, in which the Yankees look so overwhelming during the regular season and come unraveled in October, in which the A's storm into the ALCS after a sweep of Minnesota only to get swept themselves by Detroit, in which a .
Here, the publishing of the literary journal and the other activities under the agreement are a substantial part of A's activities.
The Oakland A's interactive television test is produced by ACS Sports.
Speedy A's center fielder Coco Crisp was caught stealing home in the bottom of the eighth inning with two outs trying to score the tying run, as the Oakland A's lost to the Chicago White Sox 4-3.
That A's magic number that ticked down to two when Oakland beat the Angels in extra innings Friday will remain that way when play begins tonight.