indefinite article
US /ɪnˈdɛfɪnɪt ˈɑːrtɪkl/
UK /ɪnˈdɛfɪnɪt ˈɑːrtɪkl/
1.
a determiner (such as a or an in English) that introduces a noun phrase and implies that the thing referred to is non-specific or has not been previously specified.
:
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In the sentence 'I saw a dog,' 'a' is an indefinite article.
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English has two indefinite articles: 'a' and 'an'.