half-hour - Definition from Longman English Dictionary Online

half-hour
noun

half-hour , half hour [countable]

a period of time that is 30 minutes long:

Fay had been in her room for a good half-hour.

—half-hour adjective:

a half-hour TV show

Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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half-hour noun

half-hourly adjective