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a2

 
pronunciation:
uh [or] eI
part of speech: indefinite article
definition 1: any one of a group or kind.
A horse has hooves.Somebody call a doctor!The magician told her to pick a card.
definition 2: used to introduce one particular thing or person of a group or kind, but one which is not considered known to the listener.
I walked home with a friend from school.A man with a suitcase got on the bus.
definition 3: one, as a quantity.
He dumped a cup of flour into the mixing bowl.