6 letters · 10 points in Scrabble
noun a gradual decrease in magnitude or extent
verb grow smaller
verb become smaller
originFrom Middle English waninge, alteration of earlier waniand, waniende, from Old English waniende, from Proto-Germanic *wanōndz, present participle of Proto-Germanic *wanōną (“to wane”), equivalent to wane + -ing.
Etymology from Wiktionary, CC BY-SA 3.0