The Collaborative International Dictionary of English v.0.48:
Synagogue \Syn"a*gogue\, n. [F., from L. synagoga, Gr. ? a
bringing together, an assembly, a synagogue, fr. ? to bring
together; sy`n with + ? to lead. See Syn-, and Agent.]
1. A congregation or assembly of Jews met for the purpose of
worship, or the performance of religious rites.
2. The building or place appropriated to the religious
worship of the Jews.
3. The council of, probably, 120 members among the Jews,
first appointed after the return from the Babylonish
captivity; -- called also the Great Synagogue, and
sometimes, though erroneously, the Sanhedrin.
4. A congregation in the early Christian church.
My brethren, . . . if there come into your synagogue
a man with a gold ring. --James ii.
5. Any assembly of men. [Obs. or R.] --Milton.