Definition of half:
one of two equal parts of a divisible whole; "half a loaf"; "half an hour"; "a century and one half"
one of two divisions into which some games or performances are divided: the two divisions are separated by an interval
consisting of one of two equivalent parts in value or quantity; "a half chicken"; "lasted a half hour"
partial; "gave me a half smile"; "he did only a half job"
(of siblings) related through one parent only; "a half brother"; "half sister"
partially or to the extent of a half; "he was half hidden by the bushes"