Exorcism was the employment of one spirit to control or banish another, and these tactics were also utilized for frightening ghosts and spirits. [1]
The evolution of religious observances progressed from placation, avoidance, exorcism, coercion, conciliation, and propitiation to sacrifice, atonement, and redemption. [2]
Propitiation was insurance against immediate ill luck rather than investment in future bliss. And the rituals of avoidance, exorcism, coercion, and propitiation all merge into one another. [3]
See also: UB 87:6.