flo·res·cence

[flaw-res-uhns, floh-, fluh-]
noun
the act, state, or period of flowering; bloom.

Origin:
1785–95; < Latin flōrēsc(ēns) (present participle of flōrēscere to begin blooming, inchoative derivative of flōrēre to bloom, derivative of flōs flower) + -ence

flo·res·cent, adjective
re·flo·res·cence, noun

florescence, fluorescence.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
florescence (flɔːˈrɛsəns) [Click for IPA pronunciation guide]
 
n
the process, state, or period of flowering
 
[C18: from New Latin flōrēscentia, from Latin flōrēscere to come into flower]

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Florescent is always a great word to know.
So is quincunx. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Etymonline
Word Origin & History

florescence
1793, from L. florescentem (nom. florescens) "blooming," prp. of florescere "to begin to bloom," inceptive of florere "to blossom" (see flourish).

florescent
1821, from L. florescentem, prp. of florescere (see florescence).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Try writing with florescent lighting turned off and only sunlight.
Most people today read by florescent light, which is similarly bad for the eyes.
Also these compact florescent light bulbs do not give off the light they claim,
  nor do the last as long.
Today's systems use florescent tags attached to molecules.
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