The definition of a

4 Definitions of: a

1. noun, the first letter and first vowel of the modern English alphabet
2. noun, any of several speech sounds represented by this letter, in English as in take, bag, calm, shortage, or cobra
3. noun, Also called: alpha the first in a series, esp the highest grade or mark, as in an examination
4. noun, from A to Z from start to finish, thoroughly and in detail
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1. determiner, used preceding a singular countable noun, if the noun is not previously specified or known
2. determiner, used preceding a proper noun to indicate that a person or thing has some of the qualities of the one named
3. determiner, used preceding a noun or determiner of quantity
4. determiner, used preceding a noun indicating a concrete or abstract thing capable of being divided
5. determiner, each or every; per
6. determiner, a certain; one
7. determiner, any at all ▷ See also the
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1. verb, an informal or dialect word for have
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1. preposition, (usually linked to the preceding noun) an informal form of of
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1. symbol for, acceleration
2. symbol for, are(s) (metric measure of land)
3. symbol for, atto-
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No synonyms or antonyms found for word a

From Collins