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  • noun
    plural -ers
    [count] a person who sees and notices someone or something
    The star is not visible to an observer without a telescope.
    a person who pays close attention to something and is considered to be an expert on that thing
    a person who is present at something (such as a meeting) in order to watch and listen to what happens
    The class has an observer todayso please be on your best behavior.
    used in the names of newspapers and magazines
    the Raleigh News and Observer
    the London Observer