A, a

/eɪ/ (say ay)

noun (plural A's or As or a's)
1. the first letter of the English alphabet.
2. the first in any series.
3. the highest mark for school, college, or university work; alpha.
4. Music
a. the sixth degree in the scale of C major, or the first in the relative minor scale (A minor).
b. a written or printed note representing this tone.
c. a string, key, or pipe tuned to this note.
d. (in the fixed system of solmisation) the sixth note of the scale, called la.
e. the note to which concert performers tune their instruments; concert A.
5. a series of standard paper sizes, such as A1, A3, etc., being subdivisions of the basic A0 size, 1189 × 841 mm.
phrase
6. from A to Z, from beginning to end.
{the first letter of the Roman alphabet, with prototypes alpha in Greek and aleph in the Phoenician and old Hebrew}

Australian English dictionary. 2014.

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