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OAToptional

optional

Flag: gbEnglishOxford American Thesaurus

optional
adjective
registration was obligatory but voting was optional:
voluntary, noncompulsory, at one's discretion, discretionary, not required, up to the individual, elective, nonmandatory, free, open, unforced;
Law permissive;
rare discretional.
antonyms compulsory, obligatory, mandatory, required.