More definition details:
Regeneration—Regeneration is the change brought about by
the Spirit of God, making a person a new creature in Christ: “If
anyone is in Christ, he is a new creation; the old has gone, the
new has come!” (2 Cor 5:17).
Regeneration is also described as the new birth (John 3:1–5). In
saving us, God does not simply energize the old creation with
new ability and power.
The God who created humans in the first place, only to see
them fall into sin, recreates us at salvation by the operation of
His Holy Spirit. The practical result is a radical change in the
nature, character, desires, and motives of the transformed
person.