Meaning of “observer” in the English Dictionary

british dictionary

"observer" in British English

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observernoun [ C ]

uk /əbˈzɜː.vər/ us /əbˈzɝː.vɚ/

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.

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(Definition of “observer” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"observer" in American English

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observernoun [ C ]

us /əbˈzɜr·vər/

a person who watches what happens but has no active part in it:

Political observers say it’s going to be a close election.

(Definition of “observer” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"observer" in Business English

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observernoun [ C ]

uk /əbˈzɜːvər/ us

a person who watches and studies what happens but has no active part in it:

an observer of sth He is close observer of the situation on Wall Street.
One industry observer noted: 'The car market is going through a transition.'
To an outside observer, it all seems very efficient, but the reality is somewhat different.

(Definition of “observer” from the Cambridge Business English Dictionary © Cambridge University Press)