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[
UK
/ˈɒpʃənəl/ ]
[
US
/ˈɑpʃənəɫ, ˈɔpʃənəɫ/ ]
Synonyms
free
arbitrary
discretionary
elective
unrestricted
unforced
volitional
not required
also voluntary
according to one's will
noncompulsory
nonobligatory
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