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English definition of “optional”

optional

adjective     /ˈɒp.ʃən.əl/ US  /ˈɑːp-/
B2 If something is optional, you can choose if you want to do it, pay it, buy it, etc.: English is compulsory for all students, but art and music are optional.Taking and choosing
(Definition of optional adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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