<p><strong>Adjective</strong></p><ul><li>pertaining to the principle of electing to an office, position, etc.</li><li>chosen by election, as an official.</li><li>bestowed by or derived from election, as an office.</li><li>having the power or right of electing to office, as a body of persons.</li><li>open to choice; optional; not required: an elective subject in college; elective surgery.</li><li>Synonyms: discretionary, voluntary</li><li>Antonyms: necessary, obligatory</li><li>Chemistry: selecting for combination or action; tending to combine with certain substances in preference to others: elective attraction.</li></ul><p><strong>Noun</strong></p><ul><li>an optional study; a course that a student may select from among alternatives.</li></ul>