chemiluminescence, chemiluminescent, chemoluminescence, chemoluminescent 1. Emission of light accompanying a chemical reaction, as in the oxidation of phosphorus. 2. In physical chemistry, any process in which a chemical reaction produces visible light without a corresponding increase in temperature; for example, bioluminescence; such as the light... Found on http://www.wordinfo.info/words/index/info/view_unit/1212/