noun B2 Latin origin luminescence /luːmɪˈnɛs(ə)ns/  ·  loo-mi-NES-uhns چمکنوری تابروشنی Roman Urdu: Nūrūnī roshni ENGLISH MEANING Emission of light without a rise in temperature. Luminescence is the process by which a substance releases light as a result of a chemical, biological, or physical reaction that does not produce heat. It is commonly used in scientific[...]