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ONADhalf hour

half hour

Flag: gbEnglishOxford New American Dictionary

half hour /ˌhaf ˈou(ə)r, ˌhæf ˈaʊ(ə)r/
noun (also half an hour) a period of thirty minutes:
a slide show presented every half hour.
a point in time thirty minutes after any full hour of the clock:
the library clock struck the half hour.
– DERIVATIVES
half-hourly /ˈhaf ˌou(ə)rlē, ˈhæf ˌaʊ(ə)rli/ adjective & adverb