noun
a subject or course of study that is chosen by a student rather than being compulsory
adjective
optional or chosen by election
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The student decided to take an elective course in art history to fulfill their degree requirements.
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I heard there's a really fun elective class on photography that you should take.
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I'm thinking of taking that easy elective next semester to boost my GPA.
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Choosing to travel to Europe was like an elective experience that enriched my life.