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ne·ces·si·ty

necessity

 
 
pronunciation:
n se sih ti
part of speech: noun
inflections: necessities
definition 1: a person or thing that is needed.
Eight hours of sleep every night is a necessity for me.
synonyms:
essential, need, requirement
antonyms:
luxury
similar words:
condition, fundamental, obligation, want
definition 2: the state or condition of being needed.
We understood the necessity of seeing a dentist for a toothache.
synonyms:
indispensability
similar words:
essential