The Collaborative International Dictionary of English v.0.48:

Assembly \As*sem"bly\, n.; pl. Assemblies. [F. assembl['e]e,
   fr. assembler. See Assemble.]
   1. A company of persons collected together in one place, and
      usually for some common purpose, esp. for deliberation and
      legislation, for worship, or for social entertainment.
      [1913 Webster]

   2. A collection of inanimate objects. [Obs.] --Howell.
      [1913 Webster]

   3. (Mil.) A beat of the drum or sound of the bugle as a
      signal to troops to assemble.
      [1913 Webster]

   Note: In some of the United States, the legislature, or the
         popular branch of it, is called the Assembly, or the
         General Assembly. In the Presbyterian Church, the
         General Assembly is the highest ecclesiastical
         tribunal, composed of ministers and ruling elders
         delegated from each presbytery; as, the General
         Assembly of the Presbyterian Church in the United
         States, or of Scotland.
         [1913 Webster]

   Assembly room, a room in which persons assemble, especially
      for dancing.

   Unlawful assembly (Law), a meeting of three or more persons
      on a common plan, in such a way as to cause a reasonable
      apprehension that they will disturb the peace
      tumultuously.

   Westminster Assembly, a convocation, consisting chiefly of
      divines, which, by act of Parliament, assembled July 1,
      1643, and remained in session some years. It framed the
      "Confession of Faith," the "Larger Catechism," and the
      "Shorter Catechism," which are still received as authority
      by Presbyterians, and are substantially accepted by
      Congregationalists.
      [1913 Webster]

   Syn: See Assemblage.
        [1913 Webster]

WordNet (r) 3.0 (2006):

assembly
    n 1: a group of machine parts that fit together to form a self-
         contained unit
    2: the act of constructing something (as a piece of machinery)
       [syn: fabrication, assembly] [ant: disassembly,
       dismantlement, dismantling]
    3: a public facility to meet for open discussion [syn: forum,
       assembly, meeting place]
    4: a group of persons who are gathered together for a common
       purpose
    5: a unit consisting of components that have been fitted
       together
    6: the social act of assembling; "they demanded the right of
       assembly" [syn: assembly, assemblage, gathering] [ant:
       disassembly, dismantlement, dismantling]

Moby Thesaurus II by Grady Ward, 1.0:

217 Moby Thesaurus words for "assembly":
   British Cabinet, Sanhedrin, US Cabinet, advisory body,
   architecture, assemblage, assemblee, assembly line,
   assembly-line production, assignation, association, at home, ball,
   bench, bicameral legislature, board, board of aldermen, body,
   body of advisers, borough council, brain trust, brawl, brethren,
   building, buildup, cabinet, call-up, camarilla, canvass, casting,
   caucus, census, chamber, chamber of deputies, churchgoers, circle,
   city board, city council, class, collection, colligation,
   collocation, colloquium, combination, commission, committee,
   common council, company, comparison, composition, compound,
   conclave, concourse, concurrence, conference, confluence, conflux,
   congregation, congress, connection, constitution, construction,
   consultative assembly, conventicle, convention, convergence,
   conversion, convocation, corralling, council, council fire,
   council of ministers, council of state, council of war,
   county council, court, crafting, craftsmanship, creation, crowd,
   cultivation, dance, data-gathering, date, deliberative assembly,
   devising, diet, directory, divan, eisteddfod, elaboration,
   embodiment, erection, extraction, fabrication, fashioning,
   federal assembly, festivity, fete, flock, fold, forgathering,
   formation, forming, formulation, forum, framing, gathering,
   general assembly, get-together, getup, group, growing, handicraft,
   handiwork, harvesting, horde, host, house of assembly,
   housewarming, incorporation, ingathering, inventory, junction,
   junta, juxtaposition, kitchen cabinet, laity, laymen,
   legislative assembly, legislative body, legislative chamber,
   legislature, levee, lower chamber, lower house, machining, make,
   makeup, making, manufacture, manufacturing, meet, meeting, milling,
   mining, minyan, mixture, mobilization, molding, multitude, muster,
   national assembly, nonclerics, nonordained persons, organization,
   panel, parish, parish council, parishioners, parliament, party,
   people, piecing together, plenum, prefabrication, preparation,
   privy council, processing, producing, production line, prom,
   provincial legislature, provincial parliament, putting together,
   quorum, raising, rally, reception, refining, rendezvous,
   representative town meeting, rodeo, roundup, seance, seculars,
   session, set-up, setup, shaping, sheep, shindig, sit-in, sitting,
   smelting, society, soiree, soviet, staff, state assembly,
   state legislature, structure, structuring, survey, symposium,
   syndicate, syneresis, synod, synthesis, throng, town meeting,
   tribunal, turnout, unicameral legislature, upper chamber,
   upper house, workmanship



The Free On-line Dictionary of Computing (30 December 2018):

ASSEMBLY

    An early system on the IBM 702.

   [Listed in CACM 2(5):1959-05-16].

   (1996-06-27)


Bouvier's Law Dictionary, Revised 6th Ed (1856):

ASSEMBLY. The union of a number of persons in the same place. There are
several kinds of assemblies.
     2. Political assemblies, or those authorized by the constitution and
laws; for example, the general assembly, which includes the senate and house
of representatives; the meeting of the electors of the president and vice-
president of the United States, may also be called an assembly.
     3. Popular assemblies are those where the people meet to deliberate
upon their rights; these are guaranteed by the constitution. Const. U. S.
Amend. art. 1 Const. of Penn. art. 9, s. 20.
     4. Unlawful assemblies. An unlawful assembly is the meeting of three or
more persons to do an unlawful act, although they may not carry their
purpose into execution. It differs from a riot or rout, (q.v.) because in
each of the latter cases there is some act done besides the simple meeting.