'Only begotten' in the Bible

And the "WORD became flesh, and tabernacled among us, (and we beheld his glory, the glory as of the only begotten of the Father,) full of grace and of truth.

No one has seen God at any time; the only begotten Son, who is in the bosom of the Father, he has revealed him.

For God so loved the world, that he gave his only begotten Son, that whoever believes on him should not perish, but have eternal life.

He that believes on him is not condemned; but he that believes not is condemned already, because he has not believed on the name of the only begotten Son of God.