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

That optional decision has no bearing on a firm's inclusion or ranking, either for that year's list or future lists. — Kelli Grant, Cfp®,riley De León, CNBC, 8 Oct. 2026

Conversation during the actual walking portion should remain optional. — Angela Haupt, Time, 7 Oct. 2026

Choose from three, four, and five-course with optional wine pairings. — Condé Nast, Condé Nast Traveler, 6 Oct. 2026

Crushed red pepper flakes, for garnish (optional) Directions Preheat the oven to 425°F (220°C). — ABC News, 6 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