noun, plural as·sem·blies.
  1. an assembling or coming together of a number of persons, usually for a particular purpose: The principal will speak to all the students at Friday's assembly.
  2. a group of persons gathered together, usually for a particular purpose, whether religious, political, educational, or social.
  3. (often initial capital letter) Government. a legislative body, especially the lower house of the legislature in certain states of the U.S.: a bill before the assembly; the New York State Assembly.
  4. Military.
    1. a signal, as by drum or bugle, for troops to fall into ranks or otherwise assemble.
    2. the movement of forces, tanks, soldiers, etc., scattered by battle or battle drill, toward and into a small area.
  5. the putting together of complex machinery, as airplanes, from interchangeable parts of standard dimensions.
  6. Machinery. a group of machine parts, especially one forming a self-contained, independently mounted unit.Compare subassembly.

Origin of assembly

1275–1325; Middle English assemblee < Middle French, literally, (that which is) assembled, feminine past participle of assembler to assemble
Related formspre·as·sem·bly, noun, plural pre·as·sem··as·sem·bly, noun, plural re·as·sem·blies.self-as·sem·bly, noun, plural self·-as·sem·blies.
Can be confusedassemblage assembly

Synonyms for assembly

1, 2. assemblage, gathering, congress, meeting. 2. throng. 3. congress, representatives.

Synonym study

1, 2. See convention. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for preassembly


noun plural -blies
  1. a number of people gathered together, esp for a formal meeting held at regular intervals
  2. the act of assembling or the state of being assembled
  3. the process of putting together a number of parts to make a machine or other product
  4. machinery a group of mating components before or after fitting together
  5. military
    1. a signal for personnel to assemble, as by drum, bugle, etc
    2. (as modifier)an assembly area


noun plural -blies
  1. the lower chamber in various American state legislaturesSee also House of Assembly, legislative assembly, National Assembly
  2. NZ short for General Assembly
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for preassembly

1921, from pre- + assembly.



c.1300, "a gathering of persons, a group gathered for some purpose," from Old French as(s)emblee "assembly, gathering; union, marriage," noun use of fem. past participle of assembler "to assemble" (see assemble). Meaning "gathering together" is recorded from early 15c.; that of "act of assembling parts or objects" is from 1914, as is assembly line. School sense is recorded from 1932.

Online Etymology Dictionary, © 2010 Douglas Harper