12 letters · 18 points in Scrabble
adjective increasing or having the power to increase especially in size or amount or degree
adjective intensifying by augmentation and enhancement
originFrom Middle English augmentatif, from Middle French augmentatif and its etymon Latin augmentātīvus, from augmentō. By surface analysis, augment + -ative.
Etymology from Wiktionary, CC BY-SA 3.0