Definition of “optional” - English Dictionary

“optional” in British English

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uk /ˈɒp.ʃən.əl/ us /ˈɑːp.ʃən.əl/

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.

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(Definition of “optional” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“optional” in American English

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optionaladjective [ not gradable ]

us /ˈɑp·ʃə·nəl/

not necessary or demanded but possible or available; depending on what you decide to do:

I think military service should be completely optional.

(Definition of “optional” from the Cambridge Academic Content Dictionary © Cambridge University Press)

“optional” in Business English

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uk /ˈɒpʃənəl/ us

COMMERCE something that is optional is something that you can buy or do if you want to, but that you do not have to buy or do:

Optional plug-ins cost a further $50 on average.
optional extra

COMMERCE, MARKETING something that can be added, at extra cost, to a basic product or service to make it more attractive, efficient, etc.:

Some car manufacturers offer advanced stereo systems as an optional extra on their more expensive models.

(Definition of “optional” from the Cambridge Business English Dictionary © Cambridge University Press)