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

The curds that turned generations of eaters off have become optional. — Ryan Brennan, Fort Worth Star-Telegram, 23 Sep. 2026

With the Schmiede high roof offering permanent standing height throughout the living area, the Nugget's optional rear toilet room works even better than in the pop-up version. — New Atlas, 23 Sep. 2026

Tickets starting at around 180 euros, including optional breakfast service. — Cnt Editors, Condé Nast Traveler, 22 Sep. 2026

Six years later, over 2,000 colleges and universities are still test-optional – although the categorization may be deceiving, as some scholarships may depend on SAT scores. — Beth Kania-Gosche, The Conversation, 22 Sep. 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