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adjective British English pronunciation: optional /ˈɒpʃ(ə)nəl/
  1. something that is optional is available or possible if you want it, but you do not have to have it or do it

    The price includes hotel and meals – entertainment is optional.

    Add 200 grammes of walnuts (optional).

    The history course is optional, but English is compulsory.

    an optional extra (=something that is available, usually for more money):

    Remote central locking comes as an optional extra.

derived word

optionally

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