elective
[adjective]
Synonyms: optional, discretionary, facultative, nonobligatory

[TahlilGaran] English Synonym Dictionary ▲

I. e‧lec‧tive¹ /ɪˈlektɪv/ adjective formal

1. an elective position or organization is one for which there is an election:
the 34 elective seats in the National Assembly

2. elective medical treatment is treatment that you choose to have, although you do not have to:
elective surgery such as hip replacements

3. American English an elective course is one that students can choose to take, although they do not have to take it in order to graduate ⇒ module

[TahlilGaran] Dictionary of Contemporary English ▲

II. elective² noun [countable]
American English a course that students can choose to take, but they do not have to take it in order to graduate ⇒ module

[TahlilGaran] Dictionary of Contemporary English ▲