Greek: καταλλαγη [katallagê] (Noun feminine). Exchange. Restoration to (the divine) favor. Reconciliation.

καταλλαγη [katallagê] appears 4 times in the NT:

(1) Romans 5: 11
And not only [so], but we also joy in God through our Lord Jesus Christ, by whom we have now received the atonement. - την καταλλαγην [tên katallagên] Accus. sing.

(2) Romans 11: 15
For if the casting away of them [be] the reconciling of the world, what [shall] the receiving [of them be], but life from the dead? - καταλλαγη [katallagê] Nom. sing.

(3) 2 Corinthians 5: 18
And all things [are] of God, who hath reconciled us to himself by Jesus Christ, and hath given to us the ministry of reconciliation; - της καταλλαγης [tês katallagês] Gen. sing.

(4) 2 Corinthians 5: 19
To wit, that God was in Christ, reconciling the world unto himself, not imputing their trespasses unto them; and hath committed unto us the word of reconciliation. - της καταλλαγης [tês katallagês] Gen. sing.