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English definition of “half hour”

half hour

noun [C]     (also half an hour)
a period of 30 minutes: The dollar surged against the yen in the final half hour of trading. Half an hour later, she was smiling and chatting as if nothing had happened. She is to host a new half-hour show which will be broadcast every weekday evening. Trains for Washington depart on the/every half hour (= at 10.30, 11.30, etc.).Specific periods of time
(Definition of half hour noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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