Answer: whether

AnswerCrossword Clue
WHETHERChoice word
WHETHER... or not (in any case).
WHETHER... or no
WHETHERIf
WHETHER'... -- you like it or not!'
WHETHERIf or if not
WHETHERWord used to introduce two alternatives
WHETHER... or not
WHETHERAlternative intro
whetherif it be the case that
whetherwhich one of the two