Definition of fractionations:
(n) :
(chemistry, uncountable, countable) A separation process in which a certain quantity of a mixture is divided up into smaller quantities (fractions) in which the composition changes according to a gradient; an instance of this process.
(n) :
(radiotherapy) The division of a total dose of radiation into fractions.
(n) :
A form of hypnosis where the patient is made to enter and leave a trance state many times in quick succession.
(n) :
(cryptography) A preliminary stage of encryption that divides each plaintext symbol into several ciphertext symbols.