optional

adjective

op·​tion·​al ˈäp-sh(ə-)nəl 

: involving an option : not compulsory

optionality

ˌäp-shə-ˈna-lə-tē 

noun

optionally adverb

Synonyms

• discretionary
• elective
• voluntary

Examples of optional in a Sentence

Jackets are required at the restaurant, but ties are optional.

Many optional features are available on this car.

Registration is optional, not mandatory.

Recent Examples on the Web

The experiment failed, largely because paying into the fund was optional, and employers dropped out, often to undercut their competitors. —Nina Totenberg, NPR, 31 Mar. 2025

Ensure that new or enhanced features are backward compatible and are optional and easy to adopt. —Henry Helgeson, Forbes.com, 31 Mar. 2025

This is messy and extremely optional, but Tajin lovers like me will understand. —Katlyn Moncada, Better Homes & Gardens, 31 Mar. 2025

More than 30 optional accessories are available for all models, including extra batteries, a rear cargo basket and a trailer hitch, and a travel bag. —New Atlas, 31 Mar. 2025

Word History

First Known Use

1765, in the meaning defined above

Kids Definition

optional

adjective

op·​tion·​al ˈäp-shnəl 

-shən-ᵊl

: left to one's choice : not required

optional equipment on a new car

optionally

-ē

adverb