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necessity

 
 
/nəˈsesəti/ noun

Definition

NEED [U] the need for something: There's no financial necessity for her to work. Sewing is something I do out of necessity, not for pleasure.
SOMETHING NEEDED [C] something you need: Most people seem to consider a car a necessity, not a luxury.
(Definition of necessity noun from the Cambridge Learner's Dictionary © Cambridge University Press)

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