-'s

noun suffix or pronoun suffix Etymology: Middle English -es, -s, genitive singular ending, from Old English -es; akin to Old High German -es, genitive singular ending, Greek -oio, -ou, Sanskrit -asya — used to form the possessive of singular nouns <

boy's

>, of plural nouns not ending in s <

children's

>, of some pronouns <

anyone's

>, and of word groups functioning as nouns <

the man in the corner's hat

> or pronouns <

someone else's

>