1. Environmental: Discharging, disposing, dumping, emitting, emptying, escaping, injecting, leaching, leaking, pouring, pumping, or spilling of one or more hazardous substances into the environment.
2. Legal: (1) Discharge of a property from a claim, lien, or mortgage. (2) Formal document that effects a conveyance. (3) Giving up of a claim, interest, or right. (4) Liberation of a person from custody, demand, restraint, or obligation. (5) Written statement that an obligation or requirement has been satisfied.