Atonement

[Hanseng]

The word "atonement" appears in the KJV New Testament just one time: 

Ro 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. 

The Greek word for atonement is καταλλαγή [SN/OLB# 2643] OLB refers to the Online Bible computer program.

2643 is used 4 times in the NT. Except for Romans 5:11, it is translated as reconcile/d or reconciliation:

Ro 11:15  For if the casting away of them [be] the reconciling <2643> of the world, what [shall] the receiving [of them be], but life from the dead?

2Co 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 <2643>;

2Co 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 <2643>

A closely related word is καταλλάσσω [2644]:

Ro 5:10  For if, when we were enemies, we were reconciled <2644> to God by the death of his Son, much more, being reconciled <2644>, we shall be saved by his life.
1Co 7:11  But and if she depart, let her remain unmarried, or be reconciled <2644> to [her] husband: and let not the husband put away [his] wife.
2Co 5:18  And all things [are] of God, who hath reconciled <2644> us to himself by Jesus Christ, and hath given to us the ministry of reconciliation;
2Co 5:19  To wit, that God was in Christ, reconciling <2644> the world unto himself, not imputing their trespasses unto them; and hath committed unto us the word of reconciliation.
2Co 5:20  Now then we are ambassadors for Christ, as though God did beseech [you] by us: we pray [you] in Christ’s stead, be ye reconciled <2644> to God.

 Sometimes the Greek words numbered 2643, a verb, and 2644, a noun, appear in the same verse The translation term, "atonement", used in Romans 5:11 is an outlier in  the KJV.

The Day of Atonement service in Leviticus 16 is explained in  Hebrews 10. The word "atonement" is not mentioned

1 Corinthians 7:11 uses the word translated as "atonement" in Romans 5.11. It refers to the reconciling of a couple in a troubled marriage.