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optional - definition and synonyms

 
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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 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.

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nanodegree

a course of study which is much shorter than a university course and focuses on the skills you need for a job, especially computer-related skills

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hypocaust

an ancient Roman system of underfloor heating, used to heat houses with hot air; from the Latin 'hypocaustum'

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