Gaslighting or gas-lighting is a form of mental abuse in
which false information is presented with the intent of making victims doubt
their own memory, perception, and sanity. Instances may range simply
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 play Gas Light and its film adaptations,
after which it was coined popularly. The term has been used in
clinical and research literature.