A, a[ ey ]
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noun, plural A’s or As, a’s or as.
the first letter of the English alphabet, a vowel.
any spoken sound represented by the letter A ora, as in bake, hat, father, or small.
something having the shape of an A.
a written or printed representation of the letter Aor a.
a device, as a printer’s type, for reproducing the letter A or a.
IDIOMS FOR A, A
from A to Z, from beginning to end; thoroughly; completely:He knows the Bible from A to Z.
not know from A to B, to know nothing; be ignorant.