Optional

[Sarah]

Involving an option; depending on the exercise of an option;left to one's discretion or choice; not compulsory; as, optionalstudies; it is optional with you to go or stay.-- n.

[Sarah]

Fuck OWL!

At Vanderbilt, optional means NOT OPTIONAL and not optional means NOT OPTIONAL (aka required).

[Sarah]

Not mandatory; A decision can be made in this situation.

[Tina]

Available to be chosen but not obligatory.

[Rihanna]

If something is optional, you can choose if you want to do it, pay it, buy it, etc.: