This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Persistent emission of light following exposure to and removal of incident radiation.

n. Emission of light without burning or by very slow burning without appreciable heat, as from the slow oxidation of phosphorous: "He saw the phosphorescence of the Gulf weed in the water” ( Ernest Hemingway).

n. The emission of light without any perceptible heat; the quality of being phosphorescent.

n. The quality or state of being phosphorescent; or the act of phosphorescing.

n. A phosphoric light.

n. The state or character of being phosphorescent; the property which certain bodies possess of becoming luminous without undergoing combustion.

n. a fluorescence that persists after the bombarding radiation has ceased

"This event is often referred to as phosphorescence, because when it was first studied, the light was mistakenly assumed to be caused by phosphorus."

fluorescence   

luminescence   

acquiescence    adolescence    coalescence    convalescence    essence    evanescence    luminescence    obsolescence    quintessence    senescence   

luminescence    iridescence    radiance    luminosity    sheen    shimmer    starlight    half-light    fluorescence    luminance