1.  conventicle(n = noun.group) - a secret unauthorized meeting for religious worship;
is a kind of get together, meeting

2.  conventicle(n = noun.artifact) meetinghouse - a building for religious assembly (especially Nonconformists, e.g., Quakers);
is a kind of house of god, house of prayer, house of worship, place of worship

1.  A small assembly or gathering; esp., a secret assembly. [1913 Webster]
"They are commanded to abstain from all conventicles of men whatsoever." Ayliffe. [1913 Webster]

2.  An assembly for religious worship; esp., such an assembly held privately, as in times of persecution, by Nonconformists or Dissenters in England, or by Covenanters in Scotland; -- often used opprobriously, as if those assembled were heretics or schismatics. [1913 Webster]
"The first Christians could never have had recourse to nocturnal or clandestine conventicles till driven to them by the violence of persecution." [1913 Webster]
"A sort of men who . . . attend its [the curch of England's] service in the morning, and go with their wives to a conventicle in the afternoon." [1913 Webster]

conventicle, n. esp. hist.
1 a secret or unlawful religious meeting, esp. of dissenters.
2 a building used for this.

Etymology:
ME f. L conventiculum (place of) assembly, dimin. of conventus (as CONVENE)

N  assemblage, collection, collocation, colligation, compilation, levy, gathering, ingathering, muster, attroupement, team, concourse, conflux, congregation, contesseration, convergence, meeting, levee, reunion, drawing room, at home, conversazione, assembly, congress, convention, conventicle, gemote, conclave, posse, posse comitatus, Noah's ark, miscellany, collectanea, museum, menagerie, museology, crowd, throng, group, flood, rush, deluge, rabble, mob, press, crush, cohue, horde, body, tribe, crew, gang, knot, squad, band, party, swarm, shoal, school, covey, flock, herd, drove, atajo, bunch, drive, force, mulada, remuda, roundup, array, bevy, galaxy, corps, company, troop, troupe, task force, army, regiment, host, populousness, clan, brotherhood, fraternity, sorority, association, volley, shower, storm, cloud, group, cluster, Pleiades, clump, pencil, set, batch, lot, pack, budget, assortment, bunch, parcel, packet, package, bundle, fascine, fasces, bale, seron, seroon, fagot, wisp, truss, tuft, shock, rick, fardel, stack, sheaf, haycock, fascicle, fascicule, fasciculus, gavel, hattock, stook, accumulation, congeries, heap, lump, pile, rouleau, tissue, mass, pyramid, bing, drift, snowball, snowdrift, acervation, cumulation, glomeration, agglomeration, conglobation, conglomeration, conglomerate, coacervate, coacervation, coagmentation, aggregation, concentration, congestion, omnium gaterum, spicilegium, black hole of Calcutta, quantity, collector, gatherer, whip, whipper in, assembled, closely packed, dense, serried, crowded to suffocation, teeming, swarming, populous, as thick as hops, all of a heap, fasciculated cumulative, the plot thickens, acervatim, tibi seris tibi metis.

N  council, committee, subcommittee, comitia, court, chamber, cabinet, board, bench, staff, senate, senatus, parliament, chamber of deputies, directory, reichsrath, rigsdag, cortes, storthing, witenagemote, junta, divan, musnud, sanhedrim, classis, Amphictyonic council, duma, house of representatives, legislative assembly, legislative council, riksdag, volksraad, witan, caput, consistory, chapter, syndicate, court of appeal, board of control, board of works, vestry, county council, local board, audience chamber, council chamber, state chamber, cabinet council, privy council, cockpit, convocation, synod, congress, convention, diet, states-general, assembly, caucus, conclave, clique, conventicle, meeting, sitting, seance, conference, convention, exhibition, session, palaver, pourparler, durbar, house, quorum, council fire, powwow, primary, meeting, assemblage, member, senator, member of parliament, M, P, councilor, representative of the people, assemblyman, congressman, councilman, councilwoman, alderman, freeholder, senatorial, curule, congressional, parliamentary, legislative, law-making, regulatory, deliberative.

N  temple, place of worship, house of God, house of prayer, temple, cathedral, minster, church, kirk, chapel, meetinghouse, bethel, tabernacle, conventicle, basilica, fane, holy place, chantry, oratory, synagogue, mosque, marabout, pantheon, pagoda, joss house, dogobah, tope, kiosk, kiack, masjid, parsonage, rectory, vicarage, manse, deanery, glebe, Vatican, bishop's palace, Lambeth, altar, shrine, sanctuary, Holy of Holies, sanctum sanctorum, sacristy, sacrarium, communion table, holy table, Lord's table, table of the Lord, pyx, baptistery, font, piscina, stoup, aumbry, sedile, reredos, rood loft, rood screen, chancel, quire, choir, nave, aisle, transept, vestry, crypt, golgotha, calvary, Easter sepulcher, stall, pew, pulpit, ambo, lectern, reading desk, confessional, prothesis, credence, baldachin, baldacchino, apse, belfry, chapter house, presbytery, anxious-bench, anxious-seat, diaconicum, jube, mourner's bench, mourner's seat, cloisters, churchyard, monastery, priory, abbey, friary, convent, nunnery, cloister, claustral, cloistered, monastic, monasterial, conventual, ne vile fano, there's nothing ill can dwell in such a temple.