Meaning of “necessity” in the English Dictionary

american-english dictionary

"necessity" in British English

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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)