optional

adjective

op·​tion·​al ˈäp-sh(ə-)nəl 

: involving an option : not compulsory

optionality

ˌäp-shə-ˈna-lə-tē 

noun

optionally adverb

Synonyms of optional

• 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

An antireflective coating helps users work in bright environments, while an optional nano-texture finish reduces glare further. — Aamir Khollam, Interesting Engineering, 28 Oct. 2026

Starting early has not been optional, Democratic fund-raisers say. — New York Times, 28 Oct. 2026

Forman cautioned that the British recommendations remain largely optional and that their effectiveness will depend on whether institutions act. — Ariella Noveck, FOXNews.com, 28 Oct. 2026

However, regulations such as the European Union Deforestation Regulation (EUDR) are making deforestation compliance an imperative rather than an optional sustainability endeavor. — Sarah Jones, Footwear News, 28 Oct. 2026

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