Definition of monitor noun from the Oxford Advanced American Dictionary

        

    monitor

     noun
    noun
    NAmE//ˈmɑnət̮ər//
     
     
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  1. 1a television screen used to show particular kinds of information; a screen that shows information from a computer The arrival times of today's flights are displayed on the monitor. a PC with a 17-inch color monitor see also VDT
  2. 2a piece of equipment used to check or record something a heart monitor
  3. 3a student in a school who performs special duties, such as helping the teacher
  4. 4a person whose job is to check that something is done fairly and honestly, especially in a foreign country U.N. monitors declared the referendum fair.
  5. 5a large tropical lizard (= a type of reptile )
See the Oxford Advanced Learner's Dictionary entry: monitor