This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. The intermission between halves in games of certain sports, such as basketball and football.

n. Alternative spelling of half time.

n. The halftime show, the primary "light" entertainment of a game, after the second quarter when players can physically recover, coaches can berate players with a pep talk, bets can be doubled, etc.

adj. half the ordinary time for work or attendance; as, the half-time system.

n. an intermission between the first and second half of a game, especially a football game. Also used attributively, as the halftime entertainment.

ad. for less than the standard number of hours

adj. involving half the standard or customary time for an activity

n. an intermission between the first and second half of a game

"Dole Campaign America '96: The View from the Couch, which covered how the campaign was covered, and I don't recall any of the hundreds of commentators I heard ever using the term "halftime" that way."

part-time   

pause    break    interruption    intermission    suspension   

two-goal    24-point    four-run    one-run    12-point