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

At their core, risotto recipes are quite humble, calling for rice, broth, aromatics (often some type of onion and garlic), and optional mix-ins like cheese, vegetables, wine, and meat. —Karla Walsh, Better Homes & Gardens, 18 Jan. 2025

Allwood even sells additional wall planks and an exterior awning (currently unavailable) as optional add-ons. —Olivia Young, Travel + Leisure, 18 Jan. 2025

Tickets for Mega Millions are $2 each, with an optional $1 Megaplier to increase non-jackpot prizes. —David Faris, Newsweek, 18 Jan. 2025

Taco Bell’s newest offering was made for dipping — though sharing is optional. —Tanasia Kenney, Kansas City Star, 16 Jan. 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