"PREDESTINATION"- proorizō
Acts 4:28 -------- Jesus' Crucifixion
1 Cor 2:7 -------- Glorification
Eph 1:5, 11 -------- Glorification
So, what is "predestined" in Romans 8:29?
“You will note that there is no reference in these four verses (Rom. 8:29-30; Eph. 1:5,11) to Heaven or Hell, but to Christlikeness eventually. Nowhere are we told in Scripture that God predestinated one man to be saved and another to be lost. Men are to be saved or lost eternally because of their attitude toward the Lord Jesus Christ.”
H.A. Ironside, Full Assurance (Chicago, IL: Moody Press, 1937), 93-94.
"FIRSTBORN" - prōtotokos (158 times-OT)
1- literally pertaining to birth order (the first in order).
2- pertaining to having special status associated with a firstborn (having the birth right, which was a privilege).
Ex: "of Christ, as the firstborn of a new humanity which is to be glorified, as its exalted Lord is glorified."
-William Arndt et al., A Greek-English Lexicon of the New Testament and Other Early Christian Literature (Chicago: University of Chicago Press, 2000), 894.
"pertaining to existing superior to all else of the same or related class—‘superior to, above all.’"
-Johannes P. Louw and Eugene Albert Nida, Greek-English Lexicon of the New Testament: Based on Semantic Domains (New York: United Bible Societies, 1996), 737.