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half-hour [half-hours]▼(period)noun[UK: hɑːf ˈaʊə(r)] [US: ˈhæf ˈaʊər]
half-hourly▼(twice an hour)adverb[UK: hɑːf ˈaʊə.li] [US: ˈhæf ˈaʊr.li]
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