optional

adjective

op·​tion·​al ˈäp-sh(ə-)nəl 

: involving an option : not compulsory

optionality

ˌäp-shə-ˈna-lə-tē 

noun

optionally adverb

Synonyms

• voluntary
• elective
• discretionary

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

Once in the main lounge, La Première customers can now book optional suites with a butler, a spacious living room, a bedroom with a double bed, a bathroom, and even an outdoor patio. —Michele Robson, Fortune, 5 July 2025

However, in today's rapidly changing business landscape, empathy has become essential, not optional. —Heather V. MacArthur, Forbes.com, 3 July 2025

Inside, a breathable mesh pocket adds room for silverware, snacks, or an optional ice pack, and the gingham print makes lunch feel like a picnic. —Lauren Thomann, Better Homes & Gardens, 3 July 2025

The dinner includes three courses and dessert, with optional wine pairings available. —Ana Gutierrez, Austin American Statesman, 2 July 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