Entry Word: optional

Function: adjective

Meaning: subject to one's freedom of choice <certain activities are optional, and you may choose not to participate if you wish>

Synonyms discretionary, elective, voluntary

Related Words alternative, chosen; dispensable, unnecessary, unneeded, unwanted

Near Antonyms essential, indispensable, necessary, requisite

Antonyms compulsory, mandatory, nonelective, obligatory, required