A\'s

[ey]

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 or a, as in bake, hat, father, or small.

something having the shape of an A.

a written or printed representation of the letter A or a.

a device, as a printer's type, for reproducing the letter A or a.

Idioms

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.

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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A's is always a great word to know.

So is doohickey. Does it mean:

an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.

a gadget; dingus; thingumbob.

American Heritage

Science Dictionary

A
Abbreviation of adenine, ampere, angstrom, area

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A, a