adj. voluntary, discretionary or discretional, elective, facultative, free, spontaneous, uncoerced, unforced, non-compulsory, uncompulsory, non-mandatory, unmandatory, non-requisite, unrequisite Life insurance is optional for those who have our hospitalization policy
OPTIONAL
Meaning of OPTIONAL in English
Oxford thesaurus English vocab. Английский словарь Оксфорд тезаурус. 2012