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monitor

noun [C] (PERSON WHO WATCHES)
 
 
/ˈmɒn.ɪ.tər/ US  /ˈmɑː.nɪ.t̬ɚ/

Definition

a person who has the job of watching or noticing particular things: United Nations monitors were not allowed to enter the area.Protection and protectorsEnvironmental issuesPeople who analyse and judge
(Definition of monitor noun (PERSON WHO WATCHES) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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