Impersonation (noun)

1. The act or an instance of pretending to be someone else in order to deceive others.
2. The act of assuming the character or manner of another person.

Origin:

Derived from the late latin word 'impersonare' meaning 'to personate, act the part of', 'impersonation' has been in use in english language since 17th century.

Examples:

1. The police arrested him for impersonation of a government official.
2. The impersonation was so convincing that even the victim's family was fooled.
3. The comedian's impersonation of the politician was spot on.
4. The impersonation of a doctor by the impostor put the lives of the patients at risk.
5. The impersonation of a celebrity was part of his act and was very popular with the audience.