optional

[ op-shuh-nl ]
/ ˈɒp ʃə nl /

adjective

left to one's choice; not required or mandatory: Formal dress is optional.
leaving something to choice.

Origin of optional

First recorded in 1755–65; option + -al1

OTHER WORDS FROM optional

Example sentences from the Web for optionally

British Dictionary definitions for optionally

optional
/ (ˈɒpʃənəl) /

adjective

possible but not compulsory; left to personal choice

Derived forms of optional

optionally, adverb