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English definition of “observer”

observer

noun [C]     /əbˈzɜːvər/ US  /-ˈzɝːvɚ/
C2 a person who watches what happens but has no active part in it: observers of the political situation/political observers UN observers are monitoring the ceasefire.Audiences and spectators
(Definition of observer noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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