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Meaning of disproportionation

dis•pro•por•tion•a•tion

Pronunciation: (dis"pru-pôr"shu-nā'shun, -pōr"-), [key]
— n. Chem.
  1. the simultaneous oxidation and reduction of a substance reacting with itself, thereby forming two dissimilar molecules, as 2CH→CH+CH.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.