mesomerism


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mesomerism

 [mĕ-som´er-iz'm]
the existence of organic chemical structures that cannot be accurately represented by a single structural formula, the actual formula lying intermediate between several possible representations that differ only in the position of electrons.

me·som·er·ism

(mĕ-som'er-izm),
Displacement or delocalization of electrons within a molecule in such a way as to create fractional charges on different parts of the molecule; resonance.