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

The new setup makes just 11 hp, though that number can be doubled with the optional RS package. — Bryan Hood, Robb Report, 16 Sep. 2026

Combination plans cover both, often with optional add-ons for items such as pools or septic systems. — Ryan Brennan, Miami Herald, 15 Sep. 2026

The Regents exams will continue to be offered on an optional basis. — Jennifer McLogan, CBS News, 15 Sep. 2026

The optional TrafficBoost feature increases exposure by promoting a job listing on the ZipRecruiter website, partner sites and job alert emails. — Audrey Payne, CNBC, 14 Sep. 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