elective

1 elective /ɪˈlɛktɪv/ adjective
1 elective
/ɪˈlɛktɪv/
adjective
Britannica Dictionary definition of ELECTIVE
1 
: held by a person who is elected
2 
: done or taken by choice: such as
a  : not medically necessary
b  chiefly US : not required in a particular course of study
2 elective /ɪˈlɛktɪv/ noun
plural electives
2 elective
/ɪˈlɛktɪv/
noun
plural electives
Britannica Dictionary definition of ELECTIVE
[count] US
: a class that is not required in a particular course of study
— called also (British) option