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English definition of “fortnight”

fortnight

noun [C usually singular] uk   /ˈfɔːt.naɪt/ us    /ˈfɔːrt-/ UK
B1 a period of two weeks: a fortnight's holiday once a fortnight a fortnight agoSpecific periods of time
fortnightly
adjective, adverb uk   /-li/ us  
happening every two weeks: We make a fortnightly check on supplies. The group meets fortnightly on Tuesdays.Relating to regular periods of time
(Definition of fortnight from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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