say it: ev-uh-NES-uhns
evanescence is a noun meaning "the event of fading and gradually vanishing from sight". It carries one recorded sense.
the event of fading and gradually vanishing from sight
“the evanescence of the morning mist”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for evanescence come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.