Longman Dictionary of Contemporary English homepage

optional

 adjective
     
op‧tion‧al
if something is optional, you do not have to do it or use it, but you can choose to if you want to [≠ compulsory]:
three optional courses
The other excursions are optional.
optional extra British English
Leather seats are an optional extra.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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