By Alvin Alexander. Last updated: March 20, 2013
“In computing, memoization is an optimization technique used primarily to speed up computer programs by having function calls avoid repeating the calculation of results for previously processed inputs ... Although related to caching, memoization refers to a specific case of this optimization, distinguishing it from forms of caching such as buffering or page replacement.”
From http://en.wikipedia.org/wiki/Memoization