
In quantum field theory, the statistical mechanics of fields, and the theory of self-similar geometric structures, renormalization is any of a collection of techniques used to treat infinities arising in calculated quantities. Renormalization specifies relationships between parameters in the theory when the parameters describing large distance sca...
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http://en.wikipedia.org/wiki/Renormalization

the procedure in quantum field theory by which divergent parts of a calculation, leading to nonsensical infinite results, are absorbed by ... [3 related articles]
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http://www.britannica.com/eb/a-z/r/33

A mathematical technique for looking at a physical system at different levels of magnification.
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http://www.daviddarling.info/encyclopedia/R/renormalization.html
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