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1. WordNet® 3.0 (2006)
isomerism
    n 1: the state of being an isomer; the complex of chemical and
         physical phenomena characteristic of isomers

2. The Collaborative International Dictionary of English v.0.48
Isomerism \I*som"er*ism\, n. (Chem.)
   The state, quality, or relation, of two or more isomeric
   substances.
   [1913 Webster]

   Physical isomerism (Chem.), a former term for optical
      isomerism.

   optical isomerism (Chem.), the condition or relation of
      certain (isomeric) substances, which, while chemically
      identical (in that they have the same composition, the
      same molecular weights, and the same ultimate
      constitution), are yet physically different, as in their
      action on polarized light, as dextro- and l[ae]vo-tartaric
      acids, or the sugars galactose and glucose. In such
      compounds there is usually at least one unsymmetrical
      carbon atom and typically more than one. See
      Unsymmetrical.
      [1913 Webster +PJC]

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