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noun apparatus pronunciation in American English /ˌæpəˈrætəs/ apparatus pronunciation in American English /ˌæpəˈreɪtəs/ 
Word Forms
pluralapparatuses or apparatus
  1. 1
    [countable/uncountable] the machines, tools, and equipment needed for doing something, especially something technical or scientific

    They were setting up the apparatus for the experiment.

    breathing apparatus

  2. 2
    [singular] the people and organizations involved in some aspect of government

    changes within the administrative apparatus of the ruling party

  3. 3
    [countable/uncountable] medical the organs responsible for the way a part of the body or mind works
    Synonyms and related words for this sense of apparatus


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