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

Deeper Connect has a few benefits over traditional VPNs, including Military-grade encryption, 300Mbps server speeds, built-in ad blocking, and optional parental controls. —Stackcommerce Team (sponsored), PCMAG, 21 Feb. 2025

Layer, in order, a bottom bun, Boston lettuce (optional), shrimp patty, mango slaw and, last, the top bun. —Jessica Fields, Essence, 21 Feb. 2025

Lid Lids are optional because they are not traditionally used to prepare paella. —Bestreviews, The Mercury News, 20 Feb. 2025

Physician use of the solution is optional, and patients will receive notifications before using the AI tool, giving them a choice to opt-out. —David Chou, Forbes, 19 Feb. 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