A — 1: βουλεύω
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(Strong's #1011 — Verb — bouleuo — bool-yoo'-o )

used in the Middle Voice, means (a) "to consult," Luke 14:31; (b) "to resolve," John 12:10 , AV, "consulted;" RV, "took counsel." See COUNSEL.

A — 2: συμβουλεύω
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(Strong's #4823 — Verb — sumbouleuo — soom-bool-yoo'-o )

"to take counsel together," is translated "consulted together," in Matthew 26:4 , AV (RV, "took counsel.") See COUNSEL.

B — 1: συμβούλιον
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(Strong's #4824 — Noun Neuter — sumboulion — soom-boo'-lee-on )

a word of the Graeco-Roman period (akin to A, No. 2), "counsel, advice," is translated "consulation" in Mark 15:1 (with poieo, "to make"), "to hold a consultation;" elsewhere "counsel" in the RV, except in Acts 25:12 , where, by metonymy, it means a "council." See COUNCIL.