Lewis Short
expĭātĭo (noun F) : expio
* Satisfaction, atonement, expiation (rare but class.): at vero scelerum in homines atque impietatum nulla expiatio est, * Cic. Leg. 1, 14, 40: foederis rupti,Liv. 9, 1, 4; Vulg. Exod. 29, 36 al.
Charlton T. Lewis, Charles Short, A Latin Dictionary