Webster's English Dictionary

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expansion

ex.pan.sion \ik-'span-ch*n\ n 1: the act or process of expanding  2: the 
   quality or state of being expanded  3: EXPANSE  4: the increase in volume 
   of working fluid (as steam) in an engine cylinder  after cutoff or in an 
   internal-combustion engine after explosion 5a: an expanded part  5b: 
   something that results from an act of expanding  6: the result of carrying 
   out an indicated operation : the expression of  a function in the form of a 
   series