term:

Exoneration

exoneration n

1 : the act of disburdening or discharging (as from a charge, liability, obligation, duty, or responsibility)
;also
: the state of being so freed
2 a : the right of a person who has paid a debt for which he or she is only secondarily liable to be reimbursed by the person primarily liable
b : the right of a surety to require a person or estate that is subject to a liability for which the surety is secondarily liable to discharge the liability thus relieving the surety
;also
: the equitable remedy by which the surety compels discharge of the liability

Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.