See also: Expansion and expansión



From French expansion, from Latin expānsiō. Surface analysis: expand +‎ -sion.


  • IPA(key): /ɪkˈspænʃən/
  • (file)
  • Hyphenation: ex‧pan‧sion


expansion (countable and uncountable, plural expansions)

  1. An act, process, or instance of expanding.
    The expansion of metals and plastics in response to heat is well understood.
    1. The fractional change in unit length per unit length per unit temperature change.
      Look up the expansion of 1018 steel at stick welding temps and figure out how far this thing's gonna bend once we weld it up.
      Synonym: coefficient of thermal expansion
      Hypernym: temperature coefficient
    2. (building) A new addition.
      My new office is in the expansion behind the main building.
      Synonym: annex
    3. A product to be used with a previous product.
      This expansion requires the original game board.
    4. That which is expanded; expanse; extended surface.
      • a. 1804, James Beattie, “The Beginning of the First Book of Lucretius”, in The Poetical Works of James Beattie (The Aldine Edition of the British Poets), London: Bell and Daldy [], published 1866, OCLC 6338050, pages 170–171:
        Mother of mighty Rome's imperial line, / Delight of man, and of the powers divine, / Venus, all-bounteous queen! whose genial power / Diffuses beauty in unbounded store / Through seas, and fertile plains, and all that lies / Beneath the starred expansion of the skies.
    5. (steam engines) The operation of steam in a cylinder after its communication with the boiler has been cut off, by which it continues to exert pressure upon the moving piston.
    6. (writing, editing, audio content) The replacement of a short name (e.g., acronym, initialism, alphanumeric symbol, abbreviation) with the longer name that is synonymous with it, as when spelling out acronyms to ensure clarity for a general audience.
      Expansion of acronyms is often helpful for nonexpert readers (anacronyms excluded).
      1. The string of text thus substituted.
        The acronym "FNDs" can mean either "functional neurologic disorders" or "focal neurologic deficits", so you'd better use the expansion instead of the acronym, for clarity in this context; readers of this paragraph may not have read, or remember, which definition you used 40 pages earlier.


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Related termsEdit



French Wikipedia has an article on:
Wikipedia fr


From Latin expānsiō.



expansion f (plural expansions)

  1. expansion


  • German: Expansion

Further readingEdit



From Latin expānsiō, attested from 1776.[1]


expansion c

  1. expansion


Declension of expansion 
Singular Plural
Indefinite Definite Indefinite Definite
Nominative expansion expansionen expansioner expansionerna
Genitive expansions expansionens expansioners expansionernas