Deexcitation refers to the process where an excited atom or molecule loses energy, typically through the emission of a photon. There are several synonyms that can be used to describe this phenomenon, including relaxation, quenching, or decay. In the context of fluorescence, deexcitation is often referred to as emission, which describes the release of light after the absorption of energy. Similarly, in the field of nuclear physics, deexcitation can also be referred to as decay, as it involves the transformation of a nucleus from an excited state to a lower energy state through the emission of energy. Overall, deexcitation and its synonyms play a critical role in the understanding of many physical processes.