imposter

impostor, imposter 1. Someone who pretends to be another person in order to deceive others. 2. A person who practices deception under an assumed character, identity, or name. 3. Anyone who engages in deception under an assumed name or identity. 4. Etymology: from about 1586, from Middle French imposteur, from Late Latin impostorem, impostor; fro...
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imposter

[n] - a person who makes deceitful pretenses
Found on http://www.webdictionary.co.uk/definition.php?query=imposter
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