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

The breathable fabric used on the seats makes cushions optional and gives the set a minimalist look that complements its clean silhouette. —Clint Davis, People.com, 3 May 2025

Strain into a rocks glass or up into a cocktail class that’s rimmed with tajin (also optional). —Jason O'Bryan, Robb Report, 3 May 2025

An optional morning skate was punctuated by big smiles, elaborate celebrations of pedestrian goals, loud chatter and general jocularity befitting a team with a series lead. —Mark Lazerus, New York Times, 2 May 2025

After the energy work, there’s time for stillness, reflection, or optional sharing. —Felicity Carter, Forbes.com, 1 May 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