academic specialty, adoptive, alternative, appointive, arbitrary, area, autonomous, choosing, choosy, classical education, constituent, core curriculum, course, course of study, curriculum, discipline, discretional, discretionary, discriminating, disjunctive, eclectic, electoral, field, free, free will, general education, general studies, gratuitous, humanities, independent, liberal arts, major, minor, nonmandatory, offered, optional, particular, proffered, proseminar, quadrivium, refresher course, scientific education, selecting, selective, self-acting, self-active, self-determined, self-determining, seminar, specialty, spontaneous, study, subdiscipline, subject, technical education, trivium, unasked, unbesought, unbidden, uncalled-for, uncoerced, uncompelled, unforced, uninfluenced, uninvited, unpressured, unprompted, unrequested, unrequired, unsolicited, unsought, volitional, voluntary, volunteer, willful