UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˌluːmɪˈnɛsəns/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/ˌluməˈnɛsəns/ ,USA pronunciation: respelling(lo̅o̅′mə nesəns)

WordReference Random House Learner's Dictionary of American English © 2020
lu•mi•nes•cence /ˌluməˈnɛsəns/USA pronunciation   n. [uncountable]
  1. Opticsthe giving off of light not caused by something burning, occurring at a temperature below that of burning.
  2. Opticsthe light produced in this way.
lu•mi•nes•cent, adj. 

WordReference Random House Unabridged Dictionary of American English © 2020
lu•mi•nes•cence  (lo̅o̅′mə nesəns),USA pronunciation n. 
  1. Opticsthe emission of light not caused by incandescence and occurring at a temperature below that of incandescent bodies.
  2. Opticsthe light produced by such an emission.
lu′mi•nescent, adj. 
  • Latin lūmin- (see lumen) + -escence
  • 1885–90

Collins Concise English Dictionary © HarperCollins Publishers::
luminescence /ˌluːmɪˈnɛsəns/ n
  1. the emission of light at low temperatures by any process other than incandescence, such as phosphorescence or chemiluminescence
Etymology: 19th Century: from Latin lūmen light

ˌlumiˈnescent adj
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