optional

adjective

op·​tion·​al ˈäp-sh(ə-)nəl 

: involving an option : not compulsory

optionality

ˌäp-shə-ˈna-lə-tē 

noun

optionally adverb

Synonyms

• 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

Some of these technologies are essential for ensuring the proper functioning of the service or website and cannot be disabled, while others are optional but serve to enhance the user experience in various ways. —Pitchfork, 6 Oct. 2025

No longer seen as optional, well-being has become a central driver of personal longevity and corporate success. —Sixteen Ramos, USA Today, 3 Oct. 2025

The Short model has a maximum rear load of 70 kg (154 lb), which can heft groceries/gear or carry up to two kids on optional seating. —New Atlas, 3 Oct. 2025

However, Endurance offers a wider variety of plans and more optional perks. —Brian Sloan, CNBC, 3 Oct. 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