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English definition of “necessity”

necessity

noun uk   /nəˈses.ɪ.ti/ us    /-ə.t̬i/
C1 [U] the need for something: You can come early if you want to, but there's no necessity for it. [+ to infinitive] Is there any necessity to reply to her letter? The report stresses the necessity of eating plenty of fresh fruit and vegetables. With a personal fortune of six million pounds, she certainly doesn't work out of necessity (= because she needs to). We'll employ extra staff to help out as and when the necessity arises (= when we need to). C1 [C] something that you need, especially in order to live: We brought only the bare necessities with us. He regarded music as one of life's necessities.
(Definition of necessity from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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