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

And embracing this partnership is no longer optional — resistance could mean the end of one’s career. —Priyanka Salve, CNBC, 15 Jan. 2026

The remainder of the kitchen is located across the aisle on a block that features an integrated dual-burner gas stove/sink or optional induction cooktop and independent sink. —New Atlas, 14 Jan. 2026

Ten states have chosen not to expand Medicaid to uninsured, low-income adults — an optional provision of the ACA that is mainly paid for by federal funds. —Blake Farmer, Miami Herald, 13 Jan. 2026

Keeping the trade agreement alive and fixing what does not work is not optional. —Diego Marroquin Bitar, San Diego Union-Tribune, 13 Jan. 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