EXPANSION

Definitions

1. 1. The act of expanding or spreading out; the condition of being expanded; dilation; enlargement.
2. 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. 3. Space thought which anything is expanded; also, pure space. Lost in expansion, void and infinite. Blackmore.
4. 4. Enlargement or extension of business transaction; esp., increase of the circulation of bank notes.
5. 5. The developed result of an indicated operation; as, the expansion of (a + b)2 is a2 + 2ab + b2.
6. 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. 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. 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.