Pronunciation: /ˈɑpʃənəl/
adjective describes something that is not required or mandatory, but can be chosen or not chosen at one's discretion
A1 Wearing a tie is optional for the event.
A2 Adding extra cheese to your pizza is optional.
B1 Attending the meeting is optional, but it is recommended.
B2 Completing the extra credit assignment is optional for this course.
C1 Participating in the team building exercise is optional, but encouraged.
C2 Taking the advanced level exam is optional for students who feel confident in their skills.
formal In this course, attendance is optional but highly recommended for better understanding.
informal You can join the party if you want to, but it's optional.
slang We're going to the movies later, you coming along is totally optional.
figurative For her, forgiveness was not optional; it was necessary for her own peace of mind.
optionaled
optionals
more optional
most optional
optional
will be optional
has been optional
is being optional
optional
optional
to optional
optionaling
optional