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objective (adj)
objective (n)
objectively (adv)
objectivity (n)
objet d'art (n)
obligate (v)
obligated (adj)
obligation (n)
obligatory (adj)
oblige (v)
obliged (adj)
obliging (adj)
obligingly (adv)
oblique (adj)
obliquely (adv)
obliqueness (n)
obliterate (v)
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obligatory (adj)
Synonyms: compulsory, required, essential, de rigueur, requisite, necessary

Antonym: optional


Synonyms: required, statutory, mandatory, binding, the law

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