Webster's English Dictionary

Enter the word to look up:

their

their \th*r, (.)the(*)r, (.)tha(*)r\ aj [ME, fr. their, pron., fr. ON 
   theirra, gen. pl. demonstrative & per]sonal pron.; akin to OE tht that 
   1: of or relating to them or themselves esp. as possessors {~ furn iture}, 
   agents {~ verses}, or objects of an action {~ being seen} 2: his or her : 
   HIS, HER, ITS - used with an indefin ite singular antecedent {anyone in ~ 
   senses -W. H. Auden}