Autoluminescence is defined as spontaneous emission of light from a substance without external stimulation. Synonyms for autoluminescence include self-luminescence, self-radiance, self-illumination, and self-glow. In chemistry, autoluminescence is also known as chemiluminescence or bioluminescence, which refers to the production of light by chemical or biological means, respectively. Other related terms include phosphorescence, which refers to the delayed emission of light from a substance after excitation, and fluorescence, which is the emission of light by a substance after absorption of light or other electromagnetic radiation. Understanding synonyms for autoluminescence can help scientists communicate more effectively in their research and discussions.