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 upcoming 2027 model will also be the first to feature E-Shift, an optional system that simulates the gear shifts of a combustion engine. — Bryan Hood, Robb Report, 18 Aug. 2026

Buyers can increase battery capacity up to 600 Ah and add on a variety of optional accessories, including a 200-W solar charging system, 2,000-W inverter and two 120-V electrical panels, and a Victron DC-DC charger connected to the tow vehicle. — New Atlas, 18 Aug. 2026

Recovery became part of the training plan rather than an optional treatment after practice. — Adam Annaccone, The Conversation, 18 Aug. 2026

In a routine, eyeshadow is the most optional essential on this list—which is exactly why one great palette or one great single, flattering pan is enough. — Valeriya Chupinina, Vogue, 17 Aug. 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