Definition of impostor noun from the Oxford Advanced Learner's Dictionary

 

impostor

 noun
(British English also imposter)noun
BrE BrE//ɪmˈpɒstə(r)//
 
; NAmE NAmE//ɪmˈpɑːstər//
 
 
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a person who pretends to be somebody else in order to trick people Word Origin late 16th cent. (in early use spelled imposture, and sometimes confused with imposture in meaning): from French imposteur, from late Latin impostor, contraction of impositor, from Latin imponere ‘inflict, deceive’ (from in- ‘in, upon’ + ponere ‘put’).
See the Oxford Advanced American Dictionary entry: impostor