expansion

noun

1. An act, process, or instance 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. 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 replacement of a short name (e.g., acronym, initialism, alphanumeric symbol, abbreviation) with the longer name that is synonymous with it, as when spelling out acronyms to ensure clarity for a general audience.
8. The string of text thus substituted.
9. An increase in the market value of an economy over time.
10. Stretching of geometric objects with flat sides.
11. The rewriting of an expression as a longer but equivalent sum of terms.