Gaslighting is a form of psychological manipulation that seeks to sow seeds of doubt in a targeted individual or in members of a targeted group, making them question their own memory, perception, and sanity. Using persistent denial, misdirection, contradiction, and lying, it attempts to destabilize the victim and delegitimize the victim's belief.
Instances may range from the denial by an abuser that previous abusive incidents ever occurred up to the staging of bizarre events by the abuser with the intention of disorienting the victim. The term owes its origin to the 1938 Patrick Hamilton play Gaslight and its 1940 and 1944 film adaptations, in which a man dims the gas lights in his home and then persuades his wife that she is imagining the change. The term has been used in clinical and research literature, as well as in political commentary.