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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 ?
The results of chemosystematics analysis: the ubiquitous production of flavonols in detriment of other flavonoid type metabolites resulted in a very low flavone/ flavonol ratio; the high degree of unprotected flavonoid hydroxyls (31%) and preferential hydroxyl protection by glycosylation mechanism (49%) in contrast to methylation (11%) and double protection (9%) mechanism; besides the low level of A-ring transformation, confirm the primitive positioning of the superorder Rosiflorae according to the botanists.
From inside the A-ring, I saw the highest one fluttering in the breeze above the Pentagon's roof on that beautiful fall day.
The diversion aims to enable expansion and upgrading works on Al-Diwan Intersection and the installation of new traffic lights as part of the A-Ring Road Development Project, which will contribute to enhancing traffic movement and reducing congestion in the areas surrounding A-Ring Road, Ashghal has said.
The planet's oversized family of 62 moons will soon be added when the lump from A-Ring, its outermost and brightest ring, will soon come out by 2016.
The a-ring lactone of brevetoxin PbTx-3 is required for sodium channel orphan receptor binding and activity.
Temporarily designated 1981 S13, the tiny moon apparently creates the 320-kilometer-wide "Encke's gap" in the planet's A-ring, the outermost of its clearly visible rings.
Ashghal wiil also divert traffic on part of the A-Ring Road in both directions from after Ras Bu Abboud Bridge up to Dar Al-Kutub Roundabout into a parallel diversion road with the same number of lanes.
The Public Works Authority (Ashghal) has announced that it will convert Al-Rifaa Intersection (Sanaa signal) into a temporary roundabout, in addition to diverting traffic on part of A-Ring Road in both directions, from after Ras Bu Abboud Bridge up to Dar Al-Kutub Roundabout, onto a parallel diversion road with the same number of lanes.