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essential, indispensable | absolutely necessary; vitally necessary | |
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requirement, necessity, essential, requisite, necessary | anything indispensable | |
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essential | being or relating to or containing the essence of a plant etc | |
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essential | basic and fundamental | |
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essential, all-important, crucial, all important, of the essence | of the greatest importance | |
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substantive, essential | [in law] defining rights and duties as opposed to giving the rules by which rights and duties are established |