Defamation is defined as the act of ruining someone's reputation through slander or libel.
An example of defamation is spreading lies about a public figure that destroys his career.
a defaming or being defamed; detraction, slander, or libel
Origin of defamationMiddle English defamacioun ; from Old French difamacion ; from Late Latin diffamatio
The act of defaming; calumny, slander, or libel.
From Old French diffamacion (French diffamation), from Latin diffamatio
defamation - Legal Definition
The utterance of a false statement that harms the reputation of another. Although most state laws require that a defamatory statement be made with knowledge of its falsehood, in some jurisdictions a cause of action exists for negligent defamation. Libel (involving a written false statement, including statements transmitted on the Internet) and slander (spoken, as opposed to written, false statements), are both forms of defamation.