(1):

(n.) An act by which the treats of prodigies were averted among the ancient heathen.

(2):

(n.) The means by which reparation or atonement for crimes or sins is made; an expiatory sacrifice or offering; an atonement.

(3):

(n.) The act of making satisfaction or atonement for any crime or fault; the extinguishing of guilt by suffering or penalty.