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Definition of optional:

  1. Involving an option; depending on the exercise of an option; left to one's discretion or choice; not compulsory; as, optional studies; it is optional with you to go or stay.
  2. See Elective, n.

Synonyms:

free, facultative, unforced, nonmandatory, choice, arbitrary, noncompulsory, with no strings attached, ex gratia, nonobligatory, voluntary, unrestricted, elective, not required, take it or leave it, volitional.

Usage examples: