indefinite article

noun Grammar.
an article, as English a, an, that denotes class membership of the noun it modifies without particularizing it.

Origin:
1720–30

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World English Dictionary
indefinite article
 
n
grammar Compare definite article a determiner that expresses nonspecificity of reference, such as a, an, or some

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American Heritage
Cultural Dictionary

indefinite article definition


The word a or an introducing an unspecified noun or the name of a general category: “a dog,” “an apple,” “an orange.” An is used when the next word begins with a vowel or a silent (unpronounced) h, as in “an egg” or “an hour.”

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
If the noun has the indefinite article the infinitive is better sometimes.
The control over the definite and indefinite article is examined in relation to
  their forms and functions.
Use the indefinite article an before abbreviations and acronyms that are
  pronounced as if they begin with a vowel.
The simple addition of the indefinite article a eliminates the ambiguity.
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