Adjective
Being the only child of one’s parent (especially one’s father)
(Christianity theology) One of the attributes of Jesus Christ, the only-begotten Son of God the Father.
Source: en.wiktionary.orgOnly begotten
But the Wisdom of God, which is His only-begotten Son, being in all respects incapable of change or alteration, and every good quality in Him being essential, and such as cannot be changed and converted, His glory is therefore declared to be pure and sincere. Origen
Don't hold yourselves cheap, seeing that the creator of all things and of you estimates your value so high, so dear, that he pours out for you every day the most precious blood of his only-begotten Son. Augustine of Hippo
To this day we cannot enjoy the blessing brought to us in Christ without thinking at the same time of that which God gave as adornment and honour to Mary, in willing her to be the mother of his only-begotten Son. John Calvin
We may ascertain the worth of the human race, since for its sake God's Only-begotten Son became man, and thereby ennobled the nature that he took upon him. Thomas Sydenham
That one is Fred Trump, er, The Donald, His Only Begotten Son. Source: Internet
We have also as a Physician the Lord our God, Jesus the Christ, the only-begotten Son and Word, before time began, but who afterwards became also man, of Mary the virgin. Source: Internet