Webster’s Revised Unabridged Dictionary · 1913
Elective
E·lect′ive, a. [Cf. F. électif.] 1. Exerting the power of choice; selecting; as, an elective act.
2. Pertaining to, or consisting in, choice, or right of choosing; electoral.
The independent use of their elective franchise. Bancroft.
3. Dependent on choice; bestowed or passing by election; as, an elective study; an elective office.
Kings of Rome were at first elective; . . . for such are the conditions of an elective kingdom. Dryden.
Elective affinity or attraction (Chem.), a tendency to unite with certain things; chemism.
E·lect′ive, n. In an American college, an optional study or course of study. [Colloq.]