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

For an extra $50, the optional Sidekick case carries the keyboard PC and an 11-inch iPad together, then unfolds into a tablet stand. — New Atlas, 4 Nov. 2026

Owners would eliminate a player's fourth option year and reduce optional assignments per season from five to four. — ABC News, 3 Nov. 2026

Disney says participation is optional, with staffed nonbiometric entrances and parental consent for minors. — Burak Oktenli, The Orlando Sentinel, 3 Nov. 2026

Seven Corners offers additional flexibility through its optional cancel-for-any-reason (CFAR) coverage, which can reimburse up to 75% of eligible nonrefundable expenses when travelers cancel for reasons that wouldn't otherwise qualify. — Matt Richardson, CBS News, 2 Nov. 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