The Etymology of “Atonement”

Kippur - to cover or wipe away, removing the defilement of sin from the sanctuary

The root may mean to cover (like pitch on Noah ark) or to wipe clean. Yom Kippur rituals cleansed the tabernacle from Israel accumulated impurity so God could dwell among them.

Hilasmos - propitiation or expiation, addressing the wrath or pollution caused by sin

Debated: does hilasmos appease God wrath (propitiation) or cleanse the sinner (expiation)? The LXX background suggests both: the mercy seat was both meeting place and covering.

Satisfactio - making satisfaction to God honor for the infinite debt of sin

Anselm of Canterbury (Cur Deus Homo, 1098) formalized satisfaction theory: sin dishonors God infinite majesty; only a God-man can render infinite satisfaction.

Penal substitution - Christ bears the legal penalty of sin in place of the guilty sinner

Calvin and the Reformers sharpened Anselm: not just satisfaction of honor but bearing of penalty. The just wrath of God fell on Christ so the guilty are declared righteous.

Christus Victor - Christ death as cosmic victory over sin, death, and demonic powers

Gustaf Aulen (1931) recovered the patristic Christus Victor theme. Modern theology holds multiple atonement models as facets of one mystery rather than competing theories.