noun, plural whys.
Origin of why
- for what reason, purpose, or cause?why are you here?
- (used in indirect questions)tell me why you're here
noun plural whys
Word Origin for why
Old English hwi, instrumental case (showing for what purpose or by what means) of hwæt (see what), from Proto-Germanic *khwi (cf. Old Saxon hwi, Old Norse hvi), from PIE *qwei, locative of *qwo- "who" (cf. Greek pei "where"). As an interjection of surprise or to call attention to a statement, recorded from 1510s.