Something that is false; an untrue assertion.
The falsity of that statement is easily proven.
The characteristic of being untrue.
A state or act of deceit.
A state or act of violating faith or allegiance; violation of a promise or vow, or of trust
Specifically, in warfare, an illegitimate act of deception, such as using symbols like the Red Cross or white flag in a false claim of surrender to gain proximity to an enemy for purposes of attack.