Isomer definitions

ī'sə-mər
Any of two or more substances that have the same molecular formula but differ in their connectivity or spatial arrangement of atoms, or in their topology in macromolecules.
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Any of two or more nuclei with the same mass number and atomic number that have different radioactive properties and can exist in any of several energy states for a measurable period of time.
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Any of two or more chemical compounds having the same constituent elements in the same proportion by weight but differing in physical or chemical properties because of differences in the structure of their molecules.
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Any of two or more nuclei possessing the same number of neutrons and protons, but existing in different energy states, and thus having different radioactive properties.
noun
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Any of two or more substances that have the same molecular formula but differ in their connectivity or spatial arrangement of atoms, or in their topology in macromolecules.
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Any of two or more nuclei with the same mass number and atomic number that have different radioactive properties and can exist in any of several energy states for a measurable period of time.
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(chemistry) Any of two or more compounds with the same molecular formula but with different structure.
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(physics) Any of two or more atomic nuclei with the same mass number and atomic number but with different radioactive properties.
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Origin of isomer

Greek īsomerēs having equal share īso- iso- meros part, share (s)mer-2 in Indo-European roots