(in chemical reactions) the emission of light by an atom or molecule that is in an excited state.

1900–05; chemi- + luminescence

chemiluminescent, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
chemiluminescence (ˌkɛmɪˌluːmɪˈnɛsəns)
the phenomenon in which a chemical reaction leads to the emission of light without incandescence

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American Heritage
Science Dictionary
chemiluminescence   (kěm'ə-l'mə-něs'əns)  Pronunciation Key 
The emission of light by a substance as a result of undergoing a chemical reaction that does not involve an increase in its temperature. Chemiluminescence usually occurs when a highly oxidized molecule, such as a peroxide, reacts with another molecule. The bond between the two oxygen atoms in a peroxide is relatively weak, and when it breaks the atoms must reorganize themselves, releasing energy in the form of light. Compare bioluminescence.
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