what is an indefinite article example

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Share indefinite article
“Indefinite article.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/indefinite%20article. Accessed 27 Jul. 2020.

The two indefinite articles in English are a and an. The indefinite article an is used to make pronunciation easier when reading a text aloud. The general rule is to use a when the indefinite article precedes a word beginning with a consonant sound and an when it precedes a word starting with a vowel sound.
an operation an idea an apple

Spanish indefinite articles, which translate to a, an, some or a few in English, agree with the nouns they modify in both gender and number.
Just like definite articles, indefinite articles indicate the gender (masculine or feminine) and number (singular or plural ) of a noun and have four forms, which are listed below.

References:

http://www.merriam-webster.com/dictionary/indefinite%20article
http://www.grammarly.com/blog/indefinite-articles-a-and-an/
http://www.spanishdict.com/guide/indefinite-articles-in-spanish
http://www.southampton.ac.uk/sias/resources/howtoseries/howtopaper.page