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adjective     optional pronunciation in British English
/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 mealsentertainment 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.

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gig economy

an employment concept in which people are paid for each specific, short-term task that they do and don't have conventional contracts of employment

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fake news

a sensational piece of news which does not map to reality, created to attract attention or damage somebody's reputation

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