|Int. Standard Bible Encyclopedia|
koun'-sil, koun'-siler (sumboulion): An assembly of advisers (Acts 25:12); a body of those taking counsel (see Schurer's Jewish People in the Time of Christ, I (1), 60). Distinguished from sunedrion, the supreme court of the Jews, by being of a less formal character, i.e. less of an institution. For "council" in the latter sense, its most frequent use, see SANHEDRIN. A councilor (Greek bouleutes) was a member of the Sanhedrin. Applied to Joseph of Arimathea (Mark 15:43 Luke 23:50). In the King James Version "counsellor."
Councillor (2 Occurrences)
Mark 15:43 there came Joseph of Arimathaea, a councillor of honorable estate, who also himself was looking for the kingdom of God; and he boldly went in unto Pilate, and asked for the body of Jesus. (ASV DBY)
Luke 23:50 And behold, a man named Joseph, who was a councillor, a good and righteous man (ASV DBY)