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English definition of “a”

a

indefinite article (GENERAL THING)   /ə, / (also an)
used before nouns to refer generally to someone or something that has not been mentioned before: This is a very mild cheese. Can I have a banana, please? There was a sudden loud noise. Is he a friend of yours? My birthday is on a Friday this year. You can also use "a" before some words expressing an amount: a few days a great number a lot of money
(Definition of a indefinite article (GENERAL THING) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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