'optional' definitions:
Definition of 'optional'
From: WordNet
adjective
Possible but not necessary; left to personal choice [ant: obligatory]
Synonyms of 'optional'
From: Moby Thesaurus
- alternative,
- arbitrary,
- autonomous,
- discretional,
- discretionary,
- disjunctive,
- elective,
- free,
- free will,
- gratuitous,
- independent,
- nonmandatory,
- offered,
- proffered,
- self-acting,
- self-active,
- self-determined,
- self-determining,
- spontaneous,
- unasked,
- unbesought,
- unbidden,
- uncalled-for,
- uncoerced,
- uncompelled,
- unforced,
- uninfluenced,
- uninvited,
- unpressured,
- unprompted,
- unrequested,
- unrequired,
- unsolicited,
- unsought,
- volitional,
- voluntary,
- volunteer,
- willful