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English definition of “John Doe”

John Doe

noun [U]  /ˈdʒɑn ˈdoʊ/ (female Jane Doe,  /ˈdʒeɪn ˈdoʊ/) law us  
a name used in a law court for a person whose real name is not known John Doe is also an average or typical man, and Jane Doe is an average or typical woman.
(Definition of John Doe from the Cambridge Academic Content Dictionary © Cambridge University Press)
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