Meaning

noun a gradual decline (in size or strength or power or number)

verb grow smaller

verb become smaller

originFrom Middle English wane, from Old English wana (“defect, shortage”), from Proto-West Germanic *wanō, from Proto-Germanic *wanô, from Proto-Indo-European *h₁weh₂- (“to leave, abandon; empty, deserted”). Cognates See also wan-, want, and waste. Compare also Dutch waan (“insanity”) and German Wahn (“insanity”) deprecated defect, Old Norse vanr (“lacking”) ( > Danish prefix van-, only found in…

Etymology from Wiktionary, CC BY-SA 3.0