Definition of: atone

(ə·tōn′) v. a·toned, a·ton·ing v.i.
1. To make an expiation, as for sin or a sinner; make amends, reparation, or satisfaction.
2. Obs. To be at one, agree,
—v.t.
3. Rare To expiate.
4. Obs. To propitiate; reconcile. [<earlier adverbial phrase at one in accord, short for to set at one, i.e., reconcile]
—a·ton′a·ble, a·tone′a·ble adjective
—a·ton′er noun