Main Entry: their

Pronunciation: \thər, ˈther\

Function: adjective

Etymology: Middle English, from their, pron., from Old Norse theirra, genitive plural demonstrative & personal pron.; akin to Old English thæt that

Date: 13th century

1 : of or relating to them or themselves especially as possessors, agents, or objects of an action <their furniture> <their verses> <their being seen>
2 : his or her : his, her, its —used with an indefinite third person singular antecedent <anyone in their senses — W. H. Auden>

usage see they