Elective
From BiblePortal Wikipedia
Elective [1]
(1): ( a.) Dependent on choice; bestowed or passing by election; as, an elective study; an elective office.
(2): ( a.) Pertaining to, or consisting in, choice, or right of choosing; electoral.
(3): ( n.) In an American college, an optional study or course of study.
(4): ( a.) Exerting the power of choice; selecting; as, an elective act.
