the act or process of fractionating.
the state of being fractionated.
Military. the division of a missile's payload into several warheads.

1925–30; fractionate + -ion Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
fractionate (ˈfrækʃəˌneɪt)
1.  to separate or cause to separate into constituents or into fractions containing concentrated constituents
2.  (tr) chem to obtain (a constituent of a mixture) by a fractional process

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

fractionation frac·tion·a·tion (frāk'shə-nā'shən)

  1. The process of dividing or separating into parts; breaking up.

  2. The division of a total therapeutic dose of radiation into small doses to be administered over a period of days or weeks.

  3. The separation of a chemical compound into components, as by distillation.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
fractionation   (frāk'shə-nā'shən)  Pronunciation Key 
The separation of a chemical compound into components by fractional crystallization or fractional distillation.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Both of these processes, known as fractionation, are temperature dependent.
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