Greek: πρωτοτοκος [prôtotokos] (Adjective). Firstborn.

πρωτοτοκος [prôtotokos] appears 9 times in the NT:

(1) [Matthew 1: 25]
And knew her not till she had brought forth her firstborn son: and he called his name JESUS. - τον πρωτοτοκον [ton prôtotokon] Accus. sing. masc.

(2) Luke 2: 7
And she brought forth her firstborn son, and wrapped him in swaddling clothes, and laid him in a manger; because there was no room for them in the inn. - τον πρωτοτοκον [ton prôtotokon] Accus. sing. masc.

(3) Romans 8: 29
For whom he did foreknow, he also did predestinate [to be] conformed to the image of his Son, that he might be the firstborn among many brethren. - πρωτοτοκον [prôtotokon] Accus. sing. masc. ("that he might be the firstborn among many brethren " - εις το ειναι αυτον πρωτοτοκον εν πολλοις αδελφοις [eis to einai auton prôtotokon en pollois adelphois] Lit: "in the to be him firstborn in many brothers").

(4) Colossians 1: 15
Who is the image of the invisible God, the firstborn of every creature: - πρωτοτοκος [prôtotokos] Nom. sing. masc.

(5) Colossians 1: 18
And he is the head of the body, the church: who is the beginning, the firstborn from the dead; that in all [things] he might have the preeminence. - πρωτοτοκος [prôtotokos] Nom. sing. masc.

(6) Hebrews 1: 6
And again, when he bringeth in the firstbegotten into the world, he saith, And let all the angels of God worship him. - τον πρωτοτοκον [ton prôtotokon] Accus. sing. masc.

(7) Hebrews 11: 28
Through faith he kept the passover, and the sprinkling of blood, lest he that destroyed the firstborn should touch them. - τα πρωτοτοκα [ta prôtotoka] Accus. pl. neuter.

(8) Hebrews 12: 23
To the general assembly and church of the firstborn, which are written in heaven, and to God the Judge of all, and to the spirits of just men made perfect, - πρωτοτοκων [prôtotokôn] Gen. pl. masc.

(9) Revelation 1: 5
And from Jesus Christ, [who is] the faithful witness, [and] the first begotten of the dead, and the prince of the kings of the earth. Unto him that loved us, and washed us from our sins in his own blood, - ο πρωτοτοκος [ho prôtotokos] Nom. sing. masc.