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ob·lig·a·to·ry

obligatory

pronunciation:
blI g to ri [or] a blih g to ri
part of speech: adjective
definition 1: binding in a moral or legal sense.
synonyms:
binding, compulsory, mandatory
similar words:
necessary, required
definition 2: required; compulsory.
Military service is obligatory in quite a number of countries.
synonyms:
compulsory, mandatory, required
antonyms:
optional, voluntary
similar words:
essential, involuntary, necessary, requisite