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Meaning of “necessity” in the English Dictionary

"necessity" in British English

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necessitynoun

uk   /nəˈses.ə.ti/ us   /nəˈses.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 sixty million dollars, 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.

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(Definition of necessity from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"necessity" in American English

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necessitynoun [C/U]

us   /nəˈses·ɪ·t̬i/
the need for something, or something that is needed: [U] Don’t you understand the necessity of eating a balanced diet? [U] She was forced to take the job out of necessity. [C] In my work, a computer is a necessity.
(Definition of necessity from the Cambridge Academic Content Dictionary © Cambridge University Press)
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