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English definition of “a”

a

determiner   /ə/   // (also an /ən/ /æn/)
A1 used before a noun to mean one thing or person : I need a car . Can I have an apple ?
A1 every or each: Take one pill three times a day .
A1 used to say what job someone does: She’s a mechanic .
(Definition of a determiner from the Webster's Essential Mini Dictionary © Cambridge University Press)

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