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

In practice, that bridge looks like a long questionnaire covering cycle details, digestion, sleep, stress, and tongue appearance; a personalized liquid herbal tincture; and optional ongoing coaching. — Tanya Akim, Forbes.com, 12 Aug. 2026

At least some of the original cast members must be involved, and their conspicuously aged appearance will inevitably be poignant — an optional but generally baked-in emotional component. — Vadim Rizov, IndieWire, 12 Aug. 2026

Proudly stupid and surprisingly sweet, Dylan Meyer’s stoner buddy comedy is a tribute to friendship best enjoyed with your own ride-or-die by your side — joints optional. — Angie Han, HollywoodReporter, 12 Aug. 2026

Its optional SingleLoad and DuoLoad modules deliver a slide-out cargo stack right inside the load doors, below bed level. — New Atlas, 11 Aug. 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