optional

adjective

op·​tion·​al ˈäp-sh(ə-)nəl 

: involving an option : not compulsory

optionality

ˌäp-shə-ˈna-lə-tē 

noun

optionally adverb

Synonyms

• discretionary
• elective
• voluntary

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

Ginger, black pepper, and orange juice are optional but carry greater health benefits when consumed together, said Jamie Mok, MS, RDN, a registered dietician and spokesperson for the Academy of Nutrition and Dietetics. —Caitlin Pagán, Verywell Health, 19 Mar. 2025

With optional features such as skin tone, hair color, glasses, mustache, freckles and appropriate military branch uniform, the dolls can be ordered to look like the parent. —Elizabeth Marie Himchak, San Diego Union-Tribune, 18 Mar. 2025

Belts proved their status as a necessary, no longer optional, accessory. —Sandra Salibian, WWD, 17 Mar. 2025

Then, at bedtime, the workspace can also convert into an optional children's bed. —New Atlas, 17 Mar. 2025

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