synagogue: the Jewish gathering for Scripture and prayer, the community that gathers, or the building they meet in
The word began as a plain noun built from a verb meaning to bring together, and in everyday Greek it could name almost any kind of gathering: a harvest collected, troops massed, even water pooling in one place. Jewish use narrowed it to one thing, the assembly of the people around the Law of Moses, and from there it stretched across everything that assembly involved.
That is why a single word does so much work in the New Testament. It can mean:
- the building the people meet in
- the congregation that makes up the local community
- in one famous insult, a rival group claiming a title it does not deserve
These are not unrelated ideas competing for the same spelling; they are one institution seen from different angles, and only the surrounding sentence tells you which angle is in view. When someone enters, stands up in, or builds a synagogue, a building is meant; when Paul persuades those of the synagogue, the people are meant; and when Jesus teaches in the synagogues from town to town, both the place and the community are in view at once.
Scholars once doubted that purpose-built synagogue buildings existed in Jesus' day, but inscriptions and excavated buildings from before the fall of Jerusalem in AD 70 have settled the question: the building sense was already live in the first century, at least in the Jewish homeland.
The same word also carries a sharp edge. Drawing on an old pattern from the Greek Old Testament, where a wicked faction within Israel could be called a congregation of evildoers, the book of Revelation brands a hostile group a synagogue of Satan, claiming the honored title for the true people of God and denying it to the opponents.