Chemistry. the relation of two or more compounds, radicals, or ions that are composed of the same kinds and numbers of atoms but differ from each other in structural arrangement (structural isomerism) as CH 3 OCH 3 and CH 3 CH 2 OH, or in the arrangement of their atoms in space and therefore in one or more properties. Compare optical isomerism, stereoisomerism.
Also called nuclear isomerism. Physics. the relation of two or more nuclides that have the same atomic number and mass number but different energy levels and half-lives.
Chemistry, Physics. the phenomenon characterized by such a relation.
the state or condition of being isomerous.

1830–40; isomer(ic) + -ism Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
isomerism (aɪˈsɒməˌrɪzəm)
1.  stereoisomerism See also optical isomerism the existence of two or more compounds having the same molecular formula but a different arrangement of atoms within the molecule
2.  the existence of two or more nuclides having the same atomic numbers and mass numbers but different energy states

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American Heritage
Medical Dictionary

isomerism i·som·er·ism (ī-sŏm'ə-rĭz'əm)

  1. The phenomenon of the existence of isomers.

  2. The complex of chemical and physical phenomena characteristic of or attributable to isomers.

  3. The state or condition of being an isomer.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences for isomerism
Solvation isomerism occurs when an inner sphere ligand is replaced by a solvent molecule.
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