What is regeneration according to the Word of God?

Having all sins forgiven and having the Holy Spirit take up residence in your soul.

What is regeneration according to the Word of God?

No Man is an island in as such in God he is a servant of all , too, I am that I am. The present ens God is the Word of God,

"My intercessor is my friend as my eyes pour out tears to God;"

And was revealed The Son of God in power and by the Holy Spirit, who arose from the place of the dead, Yeshua The Messiah, Our Lord.

In the origin The Word had been existing and That Word had been existing with God and That Word was himself God. John 1:1

Basically means "restored to its original pristine condition." 

Matthew 19:28 KJV — And Jesus said unto them, Verily I say unto you, That ye which have followed me, in the regeneration when the Son of man shall sit in the throne of his glory, ye also shall sit upon twelve thrones, judging the twelve tribes of Israel.

Here regeneration is Greek paliggenesia meaning 

that restoration of the original and perfect condition of things which existed before the fall of our first parents, which the Jews looked for in connection with the advent of the Messiah, and which Christians expected in connection with the visible return of Jesus from heaven.

"The Word of God" does not define the word "regeneration".

In fact: there are extremely few words that it does define.