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English definition of “monitor”

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monitor

noun [C] uk   /ˈmɒn.ɪ.tər/ us    /ˈmɑː.nɪ.t̬ɚ/

monitor noun [C] (PERSON WHO WATCHES)

B2 a person who has the job of watching or noticing particular things: United Nations monitors were not allowed to enter the area.
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monitor noun [C] (TESTING MACHINE)

a machine that regularly tests something: a radiation monitor

monitor noun [C] (SCREEN)

B2 a computer screen or a device with a screen on which words or pictures can be shown: a computer monitor a TV monitor Doctors watched the old man's heartbeat on a monitor.

monitor noun [C] (AT SCHOOL)

a child in school who has special jobs to do: the library monitor

monitor

verb [T] uk   /ˈmɒn.ɪ.tər/ us    /ˈmɑː.nɪ.t̬ɚ/
C1 to watch and check a situation carefully for a period of time in order to discover something about it: The new findings suggest that women ought to monitor their cholesterol levels. The CIA were monitoring (= secretly listening to) his phone calls.
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(Definition of monitor from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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