Dictionary.net

Latin for "to a willing person, no injury is done." This doctrine holds that a person who knowingly and willingly puts himself in a dangerous situation cannot sue for any resulting injuries.

Legal principle where one voluntarily and knowingly consents to take risks such as in dangerous sports.

[L.] In Law : no wrong is done to any one if that person consents to the thing done ; so one party to a contract may break it, if he have the consent of the other.