half-time

(sports) The interval between the two halves of a sports match.

(sometimes attributive) Half or approximately half the number of hours usually worked in a specified period.

(music) A tempo in which the rhythm is emphasized so that it seems to have half as many metric divisions (e.g. emphasizing the start of every other bar rather than every bar).

(physics) The time taken for a physical quantity to halve the difference between its present value and its final value.