The Collaborative International Dictionary of English v.0.48:
Atone \A*tone"\ ([.a]*t[=o]n"), v. i. [imp. & p. p. Atoned; p.
pr. & vb. n. Atoning.] [From at one,, i. e., to be, or
cause to be, at one. See At one.]
1. To agree; to be in accordance; to accord. [Obs.]
He and Aufidius can no more atone
Than violentest contrariety. --Shak.
2. To stand as an equivalent; to make reparation,
compensation, or amends, for an offense or a crime.
The murderer fell, and blood atoned for blood.
The ministry not atoning for their former conduct by
any wise or popular measure. --Junius.