optional
/ˈɑp.ʃə.nəl/ noun C2- Something that is not compulsory, especially part of an academic course.
- In various programming languages, a kind of variable that is assigned a specific data type but may or may not hold an actual value.
Plural optionals
Other matches
Learn optional in real texts
With a free account, hover any word in the library for its meaning, hear it read aloud, save words for review timed to your memory, and see how much of each book you already know.