I. | ̷ ̷thəˈ(r) ȯ(ə)r, -ȯ(ə) adjective
: of or marked by either-or : black-and-white
has written an either-or book in which the good are totally good and the wicked are totally bad
II. noun
( -s )
: an unavoidable choice or exclusive division between only two alternatives : dichotomy
the problem of specialized versus general courses is not one of either-or — Science
no either-or between nature and … culture — C.K.Kluckhohn