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fluctuant. adjective. 1  Subject to change or variation: variable: fluctuant oil prices. 2  Medicine Capable of being moved or compressed. 3  Used of an abnormal mass such as a tumor or abscess.4  Moving in waves.djective. 1  Subject to change or variation: variable: fluctuant oil prices. 2  Medicine Capable of being moved or compressed. 3  Moving in waves.
Fluorescence. Fluorescence is the emission of light by a substance that has absorbed light or other electromagnetic radiation. It is a form of luminescence. In most cases, the emitted light has a longer wavelength, and therefore lower energy, than the absorbed radiation.