11 letters · 18 points in Scrabble
noun a crafty and involved plot to achieve your (usually sinister) ends
originFrom Middle English machynacion, machynacyon, from Middle French machination and directly Latin māchinātiōnem, from māchinor (“devise, invent”). By surface analysis, machinate + -ion or machine + -ation.
Etymology from Wiktionary, CC BY-SA 3.0