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Stedman's Medical Dictionary
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Stedman's > fractionation

fractionation

Pronunciation: frak′shŭn-ā′shŭn
  1. To separate components of a mixture.
  2. The administration of a course of therapeutic radiation of a neoplasm in a planned series of fractions of the total dose, most often once a day for several weeks, in order to minimize radiation damage of contiguous normal tissues.