optional
5 synonyms and 8 antonyms for optional, grouped by meaning and by how common each one is.
Adjective — Not required; available to choose but not compulsory.
Synonyms
Less common
Still standard English, but they carry more weight.
Rare, literary or technical
Precise, but they will stand out — check the sense before using one.
Antonyms
How to use optional
The word patterns that sound natural to a native speaker.
Etymology
Formed from option plus the adjective ending -al.
Full origin of optional →Frequently asked questions
What does “optional” mean?
The word “optional” means not required; available to choose but not compulsory. In plain terms, something you can choose to do or have, but don't have to.
How do you pronounce “optional”?
“Optional” is pronounced OP-shuh-nuhl (/ˈɑp.ʃə.nəl/ in IPA).
How do you use “optional” in a sentence?
Here is “optional” used in a sentence: “Attendance at the workshop is optional.”
What is the opposite of “optional”?
The opposite of “optional” — its antonyms — are non-optional, nonoptional, compulsory, mandatory and obligate.
What part of speech is “optional”?
“Optional” is an adjective.
Is “optional” a common word?
“Optional” is a fairly common word in modern English, usually learned at around the B2 level.
What is the difference between optional and mandatory?
"Optional" means you are free to choose whether to do or take something; it is not required. "Mandatory" means the opposite: it must be done and you have no choice. An optional field on a form can be left blank, while a mandatory one must be filled in.
What is the difference between optional and voluntary?
"Optional" describes something available to choose but not required, often a feature, item, or setting. "Voluntary" describes an action done by free will, without being forced. A course can be optional, while attending it is voluntary.
What is the difference between optional and elective?
Both mean not compulsory, but "elective" is used in specific contexts, such as elective courses at school or elective surgery that is chosen rather than urgent. "Optional" is the more general, everyday word for anything you may choose but do not have to take.