“Rabbi” is a Hebrew word that has been transliterated into several languages including biblical Aramaic and Greek and English. The word means “my great one.” The rabbis were the Jewish religious teachers who began functioning in the two centuries before Jesus (Yeshua‘).
Jesus was called “Rabbi” on many occasions by His followers and others. The Jewish leaders objected, because according to their custom, rabbis were appointed through the laying on of hands by more experienced rabbis. They did not understand where Jesus’ authority to teach came from.
Rabbi in Greek:
Rhabbi
Strong’s Concordance number: 4461
Bible references: Matt. 26:25, 49; Mark 9:5; 11:21; 14:45; John 1:38, 49; 3:2, 26; 4:31; 6:25; 9:2; 11:8
Peter said to Jesus, “Rabbi, it is good for us to be here. Let us put up three shelters—one for you, one for Moses and one for Elijah.” (Mark 9:5 NIV)
In most places, KJV translates rhabbi as “master.”
Rhabbouni
Strong’s Concordance number: 4462
Bible references: Mark 10:51; John 20:16
Jesus said to her, “Mary.”
She turned toward Him and cried out in Aramaic, “Rabboni!” (which means “Teacher”). (John 20:16 NIV)
The equivalent English title is “teacher” (as John explains) or “leader/guide.” KJV has “Lord” in Mark 10:51.