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What does expansion mean?

Looking for the meaning or definition of the word expansion? Here's what it means.

Noun
  1. The act or process of expanding.
  2. The fractional change in unit length per unit length per unit temperature change.
  3. A new addition.
  4. A product to be used with a previous product.
  5. That which is expanded; expanse; extended surface.
  6. (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.
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