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Meaning of “optional” in the English Dictionary

"optional" in British English

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optionaladjective

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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optionaladjective

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 accessories/components
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)
What is the pronunciation of optional?
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“optional” in Business English

Avoiding common errors with the word enough.
Avoiding common errors with the word enough.
by ,
May 25, 2016
by Liz Walter Enough is a very common word, but it is easy to make mistakes with it. You need to be careful about its position in a sentence, and the prepositions or verb patterns that come after it. I’ll start with the position of enough in the sentence. When we use it with a noun,

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