expansion is a Noun
[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] Enlargement or extension of business transaction; esp., increase of the circulation of bank notes.
[5] The developed result of an indicated operation; as, the expansion of (a + b)2 is a2 + 2ab + b2.
[6] 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] 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.
[8] 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.
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