Why's

Full definition of why's

Contraction

Shortened form of why is.Why's he doing that?
Shortened form of why has.Why's everyone gone home?

Noun

noun plural form

Alternative spelling of whys Plural of why

1977: I was never able to stop the search for the why's and how's of something so senseless as the arms race. (Nobel Peace Prize Alva Myrdal)

Alva Myrdal (1977), The Game of Disarmament: How the United States and Russia Run the Arms Race (1st ed.), UK: Manchester University Press ND, , in "A Personal Note" (foreword), p. xxiii