Expansion Ex*pan"sion, n. [L. expansio: cf. F. expansion.] 1. The act of expanding or spreading out; the condition of being expanded; dilation; enlargement. [1913 Webster]

2. That which is expanded; expanse; extend surface; as, the expansion of a sheet or of a lake; the expansion was formed of metal. [1913 Webster]

The starred expansion of the skies. --Beattie. [1913 Webster]

3. Space through which anything is expanded; also, pure space. [1913 Webster]

Lost in expansion, void and infinite. --Blackmore. [1913 Webster]

4. (Economics & Commmerce) an increase in the production of goods and services over time, and in the volume of business transactions, generally associated with an increase in employment and an increase in the money supply. Opposite of {contraction}.

Syn: economic expansion. [1913 Webster +PJC]

5. (Math.) The developed result of an indicated operation; as, the expansion of (a + b)^{2} is a^{2} + 2ab + b^{2}. [1913 Webster]

6. (Steam Engine) 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. [1913 Webster]

7. (Nav. Arch.) The enlargement of the ship mathematically from a model or drawing to the full or building size, in the process of construction. --Ham. Nav. Encyc. [1913 Webster]

Note: Expansion is also used adjectively, as in expansion joint, expansion gear, etc. [1913 Webster]

8. an enlarged or extended version of something, such as a writing or discourse; as, the journal article is an expansion of the lecture she gave. [PJC]

9. an {expansion joint}. See below. [Colloq. or jargon] [PJC]

{Expansion curve}, a curve the co["o]rdinates of which show the relation between the pressure and volume of expanding gas or vapor; esp. (Steam engine), that part of an indicator diagram which shows the declining pressure of the steam as it expands in the cylinder.

{Expansion gear} (Steam Engine). a cut-off gear. See Illust. of {Link motion}.

{Automatic expansion gear} or {Automatic cut-off}, one that is regulated by the governor, and varies the supply of steam to the engine with the demand for power.

{Fixed expansion gear}, or {Fixed cut-off}, one that always operates at the same fixed point of the stroke.

{Expansion joint}, or {Expansion coupling} (Mech. & Engin.), a yielding joint or coupling for so uniting parts of a machine or structure that expansion, as by heat, is prevented from causing injurious strains; as: (a) A slide or set of rollers, at the end of bridge truss, to support it but allow end play. (b) A telescopic joint in a steam pipe, to permit one part of the pipe to slide within the other. (c) A clamp for holding a locomotive frame to the boiler while allowing lengthwise motion. (d) a strip of compressible material placed at intervals between blocks of poured concrete, as in roads or sidewalks.

{Expansion valve} (Steam Engine), a cut-off valve, to shut off steam from the cylinder before the end of each stroke. [1913 Webster]

The Collaborative International Dictionary of English. 2000.


Look at other dictionaries:

  • Expansion — Expansion …   Deutsch Wörterbuch

  • expansion — [ ɛkspɑ̃sjɔ̃ ] n. f. • 1584; lat. expansio, de expandere « déployer » 1 ♦ Phys. Accroissement de volume (d un fluide). Expansion de l air, d un gaz par élévation de la température (⇒ dilatation) , par diminution de pression (⇒ décompression) . La …   Encyclopédie Universelle

  • Expansion — may refer to: *In physics: ::*expansion of space, ::*thermal expansion, ::*expansion fan. *In computer hardware: an expansion card *In computer programming: JEE5 developing tool in line expansion *In engineering expansion is the increase in the… …   Wikipedia

  • Expansion — steht für: Expansion des Universums Expansion von Staaten, eine Erweiterung des Staatsgebiets zu Lasten der Nachbarn oder durch Kolonisation (vgl. Europäische Expansion) Expansion (Wirtschaft), das Wachstum im wirtschaftlichen Bereich die… …   Deutsch Wikipedia

  • Expansión — Saltar a navegación, búsqueda Expansión puede hacer referencia a: Expansión (videojuegos), adición a un juego existente; Revista Expansión, revista de negocios mexicana; Expansión (periódico), diario económico español propiedad del grupo… …   Wikipedia Español

  • Expansion — Sf Ausweitung, Vergrößerung erw. fach. (19. Jh.) Entlehnung. Entlehnt aus frz. expansion, dieses aus l. expānsio ( ōnis), einem Abstraktum zu l. expandere ausdehnen , einem Intensivum zu l. pandere (pānsum) ausbreiten und l. ex ; (unregelmäßiges) …   Etymologisches Wörterbuch der deutschen sprache

  • expansión — sustantivo femenino 1. (no contable) Extensión o dilatación de una cosa: Se teme la expansión de los gases tóxicos. Hay que cortar la expansión de la mancha de petróleo en el mar. 2. Manifestación efusiva de un sentimiento o pensamiento: En un… …   Diccionario Salamanca de la Lengua Española

  • Expansión — is a Spanish economic newspaper published by Unidad Editorial.External links* [http://www.expansion.com Expansión web site] …   Wikipedia

  • Expansión — Pays  Espagne Langue Espagnol Périodicité Quotidien Genre Presse économique Éditeur Madrid …   Wikipédia en Français

  • expansion — 1610s, anything spread out; 1640s, act of expanding, from Fr. expansion, L.L. expansionem (nom. expansio) a spreading out, noun of action from pp. stem of L. expandere (see EXPAND (Cf. expand)) …   Etymology dictionary

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