Definition of device noun from the Oxford Advanced American Dictionary

        

    device

     noun
    noun
    NAmE//dɪˈvaɪs//
     
     
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  1. 1 an object or a piece of equipment that has been designed to do a particular job a water-saving device This device enables deaf people to communicate by typing messages instead of speaking. electronic labor-saving devices around the home
  2. 2a bomb or weapon that will explode A powerful device exploded outside the station. the world's first atomic device
  3. 3a method of doing something that produces a particular result or effect Sending advertising by e-mail is very successful as a marketing device.
  4. 4a plan or trick that is used to get something that someone wants The report was a device used to hide rather than reveal problems.
  5. Idioms
    leave somebody to their own devices
     
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    to leave someone alone to do as they wish, and not tell them what to do
See the Oxford Advanced Learner's Dictionary entry: device