half Definition in the Cambridge English Dictionary
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Definition of “half” - English Dictionary

Definition of "half" - American English Dictionary

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halfpronoun, noun [C/U]

 us   /hæf/ (plural halves  /hævz/ )
either of the two ​equal or ​nearlyequalparts that together make up a ​whole: [U] Half of 12 is 6. [U] Half (of) the ​students are Spanish. [U] Cut the ​apple in half (= into two ​equalparts). [C] The ​recipecalls for a ​pound and a half of ​potatoes. In ​sports, a half is one of two ​equalperiods of ​play, often with a ​shortpause for ​rest between them.

halfadjective, adverb [not gradable]

 us   /hæf/
referring to either of the two ​equal or ​nearlyequalparts that together make up a ​whole: Each ​talk should last about a half ​hour/half an ​hour (= 30 ​minutes). We need half a ​dozen (= six)eggs. Half also ​meanspartly or not ​completely: She was still ​sleepy and only half ​aware of what was ​happening. I half ​expected (= ​almostexpected) to ​see her at the ​party.
(Definition of half from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "half" - British English Dictionary

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halfnoun, pronoun, predeterminer, adjective, adverb

uk   /hɑːf/  us   /hæf/
A2 either of the two ​equal or ​nearlyequalparts that together make up a ​whole: "What's half of 96?" "48." Roughly half (of) the ​class are ​Spanish and the ​others are a ​mixture of ​nationalities. Cut the ​apple in half/into halves (= into two ​equalparts). My little ​brother is half astall as me/half my ​height. half a ​dozen (= six)eggs Half of me would just like to give it all up and ​travel around the ​world (= ​partly I would like to, but ​partly I would not). She was ​born in the ​latter half of the 18th ​century. The ​recipetells you to use a ​pound and a half of ​butter.B2 informal a lot: She ​invited a lot of ​people to the ​party but half of them didn't ​turn up. I don't ​evenknow where she is half (of) the ​time.half past A1 Half past a ​particularhour is 30 ​minuteslater than that ​hour: I'll ​meet you at half past nine (= 09.30 or 21.30).UK informal I'll ​meet you at half seven (= half past seven).B1 only ​partly: He ​answered the ​door half ​naked. I was half ​expecting to ​see her at the ​party. I'm half ​inclined to take the ​job just because it's in Argentina. He was being ​funny but I ​think he was half ​serious. The bottle's half ​empty.go halves informal to ​divide the ​cost of something with someone: Shall we go halves on a ​bottle of ​champagne? I'll go halves with you on a ​bottle of ​champagne.half and half equalamounts of two different things: You can use just ​sugar, just ​honey, or half and half.
See also
half as much again 50 ​percent more of the ​existingnumber or ​amount
More examples

halfnoun [C]

uk   /hɑːf/  us   /hæf/ (plural halves)

half noun [C] (SPORT)

first/second half either of two ​periods of ​time into which a ​game is ​divided

half noun [C] (DRINK)

UK informal half a pint of a ​drink, ​especiallybeer: A ​pint of ​lager and two halves, ​please.

half noun [C] (TICKET)

UK a ​ticket that is ​cheaper because it is for a ​child: Two (​adults) and three halves to Manchester, ​please.
(Definition of half from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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