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 kitchen block is located to the right of the entry, utilizing an optional portable induction cooker, rectangular sink with flush-mount lid and available 90-L Isotherm door fridge. — New Atlas, 8 July 2026

In environments where software influences real clinical decisions, rigor is not optional. — Boris Berat, Forbes.com, 8 July 2026

Around 80% of Rilla’s workers use the housing stipend, which is optional. — Emma Burleigh, Fortune, 8 July 2026

Rather than conventional seats, the cushions are fixed directly to the chassis, and there’s an optional sustainable textile called InnoKnit, which sweeps across the sills and cockpit like a breaking wave. — Jason Barlow, Robb Report, 7 July 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