Definitions
1.nounThe act or process of expanding."The expansion of metals and plastics in response to heat is well understood."
2.nounThe fractional change in unit length per unit length per unit temperature change.
3.nounA new addition."My new office is in the expansion behind the main building."
4.nounA product to be used with a previous product."This expansion requires the original game board."
5.nounThat which is expanded; expanse; extended surface.
6.noun(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.