Article (abbreviated art) is a word (or prefix or suffix) that is used with a noun to indicate the type of reference being made by the noun. Articles specify grammatical definiteness of the noun, in some languages extending to volume or numerical scope. The articles in the English language are the and a/an, and (in some contexts) some. An and a are modern forms of the Old English an, which in Anglian dialects was the number one (compare on, in Saxon dialects) and survived into Modern Scots as the number ane. Both on (respelled one by the Normans) and an survived into Modern English, with one used as the number and an (a, before nouns that begin with a consonant sound) as an indefinite article.
an Article is a word that is used with noun to indicate