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English definition of “half”

half

noun, determiner
 
 
/hɑːf/ (plural halves)
A2 [C, U] one of two equal parts of something; 1/2: Rice is eaten by half of the world's population. Cut the lemons into halves. It'll take half an hour to get there. Jenny lived in Beijing for a year and a half.Fractions
break/cut/split sth in half B1 to divide something into two equal parts: Divide the dough in half and roll it out into two circles.IncompleteSeparating and dividing
decrease/increase, etc sth by half to make something smaller/larger, etc by half its size: The drug reduces the risk of stroke by half.FractionsIncompleteBecoming and making smaller or lessBecoming and making less strong
half past one/two/three, etc mainly UK A1 30 minutes past one o'clock/two o'clock/three o'clock, etc: We got back to our hotel at half past seven.Watches and clocks
half one/two/three, etc UK informal A1 30 minutes past one o'clock/two o'clock/three o'clock, etc: "What time does it start?" "About half six."Watches and clocks
(Definition of half noun, determiner from the Cambridge Learners Dictionary © Cambridge University Press)
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