hour Definition in Cambridge British English Dictionary
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Definition of "hour" - British English Dictionary

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hournoun

uk   /aʊər/  us   /aʊr/
A1 [C] a period of 60 minutes: The exam lasted 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 particular amount 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 particular activity happens or when a shop or public building 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 particular time 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 works unsocial hours. He's paid well but he works long hours.for hours (and hours) B1 informal for a very long time: I waited for him for hours.at all hours (of the day and night) C1 disapproving repeatedly during the day and the night: They keep calling me at all hours (of the day and night).
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(Definition of hour from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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