EXPANSION

expansion, enlargement

(noun) the act of increasing (something) in size or volume or quantity or scope

expansion, expanding upon

(noun) adding information or detail

expansion, enlargement, elaboration

(noun) a discussion that provides additional information

expansion

(noun) a function expressed as a sum or product of terms; “the expansion of (a+b)^2 is a^2 + 2ab + b^2”

Source: WordNet® 3.1

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Etymology

Noun

expansion (countable and uncountable, plural expansions)

The act or process of expanding.

The fractional change in unit length per unit length per unit temperature change.

A new addition.

A product to be used with a previous product.

That which is expanded; expanse; extended surface.

(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.

Antonyms

• (act of expanding): contraction, shrinkage

Source: Wiktionary

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Ex*pan"sion, n. Etym: [L. expansio: cf. F. expansion.]

1. The act of expanding or spreading out; the condition of being expanded; dilation; enlargement.

2. That which is expanded; expanse; extend surface; as the expansion of a sheet or of a lake; the expansion was formed of metal. The starred expansion of the skies. Beattie.

3. Space thought which anything is expanded; also, pure space. Lost in expansion, void and infinite. Blackmore.

4. (Com.)

Definition: Enlargement or extension of business transaction; esp., increase of the circulation of bank notes.

5. (Math.)

Definition: The developed result of an indicated operation; as, the expansion of (a + b)2 is a2 + 2ab + b2.

6. (Steam Ebgine)

Definition: 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.

7. (Nav. Arch.)

Definition: 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.

Note: Expansion is also used adjectively, as in expansion joint, expansion gear, etc. Expansion curve, a curve the coördinates 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 (Stream Engine). a cut-off gear. See Illust. of Link motion.

– Automatic expansion gear or 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 by heat, is prevented from causing injurious strains; as: (a) A side 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.

– Expansion valve (Steam Engine), a cut-off valve, to shut off steam from the cylinder before the end of each stroke.

Source: Webster’s Unabridged Dictionary 1913 Edition

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