elec·tive /ɪˈlɛktɪv/
 (a.)選舉的,根據選舉的,選任的選修課程
 elec·tive /ɪˈlɛktɪv/ 形容詞
 選擇的,可以選擇的
 E·lect·ive, n. In an American college, an optional study or course of study; a course that is not required. [Colloq.]
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 E·lect·ive a.
 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. Bestowed or passing by election; as, an elective office.
    Kings of Rome were at first elective; . . . for such are the conditions of an elective kingdom.   --Dryden.
 4. Dependent on choice; that can be refused; as, an elective college course.  Opposite of required or mandatory.
 Elective affinity or Elective attraction Chem., a tendency to unite with certain things; chemism.
 elective
      adj 1: subject to popular election; "elective official" [syn: elected]
             [ant: appointive]
      2: not compulsory; "elective surgery"; "an elective course of
         study"