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necessity

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necessity/nɪˈsɛsəti/noun
pluralnecessities
necessity
/nɪˈsɛsəti/
noun
pluralnecessities
Learner's definition of NECESSITY  
[count] : something that you must have or do: something that is necessary
[noncount]formal : the quality of being necessary— usually + of or for

by necessity

orout of necessity
: because of conditions that cannot be changed

make a virtue (out) of necessity

— see virtue

necessity is the mother of invention

— see 1mother

of necessity

formal
— used to say that something must happen or must be the way it is
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