affranchisement

Manumission, or affranchisement, is the act of an owner freeing his or her slaves. Different approaches developed, each specific to the time and place of a particular society. Jamaican historian Verene Shepherd states that the most widely used term is gratuitous manumission, "the conferment of freedom on the enslaved by enslavers before the end of the slave system". https://en.wikipedia.org/wiki/Manumission