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adjectival nouns or quasi-adjectives (keiyodoshi)
necessary, needed, essential, indispensable
必用 can imply has to be used rather than is just needed-
私達が生きていくためには衣食住が必要です。
We need food, clothes and a home in order to live.
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noun (common) (futsuumeishi)
necessity, need, requirement
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歯医者に行く必要はないですよ。
You don't need to go to the dentist's.
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