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.

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Origin of optional

First recorded in 1755–65; option + -al1

OTHER WORDS FROM optional

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for optional

British Dictionary definitions for optional

optional
/ (ˈɒpʃənəl) /

adjective

possible but not compulsory; left to personal choice

Derived forms of optional

optionally, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012