Strong's #4824: sumboulion (pronounced soom-boo'-lee-on)
 neuter of a presumed derivative of 4825; advisement; specially, a deliberative body, i.e. the provincial assessors or lay-court:--consultation, counsel, council.
Thayer's Greek Lexicon:
 ́ 
 
  sumboulion 
 
 1) counsel, which is given, taken, entered upon
 
 1a) consult, deliberate
 
 2) a council
 
 2a) an assembly of counsellors or persons in consultation (the governors and procurators of provinces had a board of assessors or advisers with whom they took council before rendering judgment)
 
  Part of Speech: noun neuter
Relation: from a presumed derivative of G4825
 
Usage:
This word is used 8 times:
Matthew 12:14: "Pharisees went out, and held  a council against him, how they might destroy"
Matthew 22:15: "Pharisees, and took  counsel how they might entangle him in"
Matthew 27:1: "of the people took  counsel against Jesus to put him to death:"
Matthew 27:7: "And they took  counsel, and bought with them the potter's"
Matthew 28:12: "elders, and had taken  counsel, they gave large money unto the"
Mark 3:6: "Pharisees went forth, and straightway  took counsel with the Herodians"
Mark 15:1: "the chief priests held  a consultation with the elders and"
Acts 25:12: "when he had conferred with the  council, answered, Hast thou appealed unto Caesar? unto"