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substitution reaction

noun, Chemistry
1.
the replacement of an atom or group of atoms in a compound by another atom or group.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Article for substitution reaction

displacement reaction

any of a class of chemical reactions in which an atom, ion, or group of atoms or ions in a molecule is replaced by another atom, ion, or group. An example is the reaction in which the chlorine atom in the chloromethane molecule is displaced by the hydroxide ion, forming methanol:

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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