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English definition of “necessity”

necessity

noun [C/U]  /nəˈses·ɪ·t̬i/ us  
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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