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addition reaction

noun, Chemistry
1.
a reaction in which part of a compound is added to one end of a double or triple bond, while the rest adds to the other end, converting it, respectively, to a single or double bond.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Article for addition re action

addition reaction

any of a class of chemical reactions in which an atom or group of atoms is added to a molecule.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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