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observer

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noun [countable] observer pronunciation in American English /əbˈzɜrvər/ 
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singularobserver
pluralobservers
  1. 1
    someone who sees or notices something

    Observers said soldiers opened fire on the camp's inhabitants.

    casual observer (=someone not paying much attention):

    The most casual observer would have noticed his strange behavior.

  2. 3
    someone whose opinions are broadcast or published because they know a lot about a particular subject

    Many political observers believe that the election is already decided.

    observer of:

    He was a witty and cynical observer of the social scene.

    1. a.
      someone who visits a place officially to make sure that something is done fairly and correctly
      foreign/outside/military/independent observers:

      Foreign observers declared the elections fair.

    2. b.
      someone who is present at an event but takes no active part

      I was invited to attend their conference as an observer.

pre-cation

a paid holiday given to a new employee before they start their job

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