noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   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 countable, uncountable
2. 2
   Conversion of a lower radio frequency to a higher frequency, possibly using a mixer. countable, uncountable

Etymology

From up- + conversion.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.