council: a formally seated body of leaders gathered to deliberate and judge, above all the ruling court in Jerusalem
At root the word means "a sitting together." In everyday Greek it named any officially convened council that met to decide matters, and the New Testament keeps that flexibility while pointing it mostly at one target: the ruling council in Jerusalem, the body English Bibles often simply call "the Sanhedrin." That council was made up of the leading priests, the elders of the leading families, and the scribes, with the high priest presiding.
The same word stretches naturally in three directions that all share the one idea of an authorized council. It can name:
- the standing leadership body itself, gathered to decide the fate of Jesus and, in Acts, of his followers
- a particular session of that body, and by a small step the very room in which it met
- the local Jewish courts of a town, which is why the word turns up in the plural when Jesus warns his disciples they will be handed over to "councils"
These are shades of one meaning rather than separate words: in each case it is a lawful assembly of leaders sitting in judgment. Which shade is in view is settled by the context, not by the word on its own, and the reader has to supply that context. A related complication sits underneath the word: how organized and permanent this Jerusalem council actually was in the first century is one of the long-running debates of New Testament history, and it colors how the trial scenes are read.