hour Meaning in the Cambridge English Dictionary
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Meaning of “hour” in the English Dictionary

"hour" in British English

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hournoun

uk   /aʊər/  us   /aʊr/
A1 [C] a ​period of 60 ​minutes: The ​examlasted an hour and a ​half. There are 24 hours in a ​day. How many hours' ​sleep do you need? I'll be back in an hour's/two hours' time (= after one/two hours). My ​hometown is an hour from Houston/an hour away (= it ​takes an hour to ​travel there). He gets ​paid by the hour (= gets a ​particularamount of ​money for each hour he ​works). Trains ​leave every hour on the hour (= at ​exactly one o'clock, two o'clock, etc.). Buses ​leave at ten ​minutes past/to the hour (= at ten past/to one o'clock, two o'clock, etc.).formal War was ​declared at eighteen hundred hours/18.00 hours (= at six o'clock in the ​evening). [C usually plural] the ​period of ​time when a ​particularactivityhappens or when a ​shop or ​publicbuilding is ​open: I ​try to ​spend my lunch hour ​walking. office/working hours Our opening hours are from 8.00 to 6.00.C2 [C] a ​particulartime during the ​day or ​night: Who could be ​calling us at this unearthly/​ungodly hour (= so late at ​night)? He ​returned in the early/​small hours (= at ​night, after ​midnight).work long, regular, unsocial, etc. hours used to ​describe how many hours in the ​day you ​work or what ​part of the ​day you ​work: She's a ​nurse so she often ​worksunsocial hours. He's ​paid well but he ​workslong hours.for hours (and hours) B1 informal for a very ​longtime: I ​waited for him for hours.at all hours (of the day and night) C1 disapproving repeatedly during the ​day and the ​night: They ​keepcalling me at all hours (of the ​day and ​night).
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(Definition of hour from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"hour" in American English

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hournoun [C]

 us   /ɑʊər/ (abbreviation hr.)
a ​period of 60 ​minutes: Take this an hour after ​eating. It’s ​open 24 hours a ​day. He ​workslong hours (= ​startswork early and ​finishes late). He gets ​paid by the hour (= for each hour ​worked). Buses ​pull out every hour on the hour (= at the ​time an hour ​begins). An hour can be a ​period of ​time, not ​necessarily 60 ​minutes, when you do something: a ​lunch hour An hour can be the ​distance you can ​travel in 60 ​minutes: San Francisco is only a ​couple of hours away.
(Definition of hour from the Cambridge Academic Content Dictionary © Cambridge University Press)
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