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nauseating (adj)
nauseatingly (adv)
nauseous (adj)
nauseously (adv)
nautical (adj)
naval (adj)
navel (n)
navel-gazing (n)
navigable (adj)
navigate (v)
navigation (n)
navigational (adj)
navigator (n)
navvy (n)
navy (n)
nay (adv)
ne'er-do-well (n)
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necessary (adj)
Synonyms: essential, needed, required, compulsory, obligatory, indispensable, basic, crucial, vital, de rigueur, necessitous, mandatory

Antonym: optional
Encarta® World English Dictionary [World English Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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