ESV
Act 2:38 And Peter said to them, "Repent and be baptized every one of you in the name of Jesus Christ for the forgiveness of your sins, and you will receive the gift of the Holy Spirit.
áphesis; gen. aphéseōs, fem. noun. from aphíēmi (G863), to cause to stand away, to release one's sins from the sinner. Forgiveness, remission.
Dictionary.com
REMISSION
1.the act of remitting.
2.pardon; forgiveness, as of sins or offenses.