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The Simple English Wikipedia has an article on:
apparatus is on the Basic English 850 List.
any - apparatus - apple

Pronunciation change

  • IPA (key): /æ.pəˈræ.təs/ or /æ.pəˈreɪ.təs/ or /æpərɑːtəs/
  • (file)

Noun change

Singular
apparatus

Plural
apparatuses

 
An apparatus
  1. A complex machine or instrument.
  2. A group of tools or instruments.
  3. A system of things to do to get to a goal.