The meaning of IMPOSTOR is one that assumes false identity or title for the purpose of deception. How to use impostor in a sentence. The noun ' impostor ' has its origins in the late 16th century and is derived from the term ' impostor ,' which in turn comes from the Latin word ' impostor ,' meaning 'deceiver' or 'imposer.' In Latin, ' impostor ' was used to describe someone who engaged in deceitful practices by pretending to be something or someone they were not. Over time, ' impostor ' made its way into the English language, retaining its fundamental meaning of an individual who pretends to be someone else, typically with the ... Over time, ' impostor ' evolved into ' imposter ' in English, retaining its fundamental meaning of an individual who assumes a false identity or persona to mislead or deceive others. How do you spell imposter ? Learn the difference between impostor and imposter with definitions and sentence examples at Writing Explained. How to spell imposter ? Impostor spelling.