Usually means: Conversion of low to high frequency.
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We found 4 dictionaries that define the word upconversion:

General (3 matching dictionaries)
  1. Upconversion, upconversion: Wordnik
  2. upconversion: Wiktionary
  3. Upconversion: Wikipedia, the Free Encyclopedia

Computing (1 matching dictionary)
  1. Webopedia (No longer online)

Definitions from Wiktionary (upconversion)

noun:  (physics) The process by which two photons combine in a nonlinear medium to produce a higher-energy photon with a frequency that is the sum of those of the two photons
noun:  (electronics) Conversion of a lower radio frequency to a higher frequency, possibly using a mixer.

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