12 letters · 15 points in Scrabble
noun the amount by which something increases
noun the statement of a theme in notes of greater duration (usually twice the length of the original)
noun the act of augmenting
originFrom Middle English augmentation, augmentacion, augmentacioun, from Old French augmentacion, from Latin augmentātiō, verbal noun from augmentō (“increase”, verb).
Etymology from Wiktionary, CC BY-SA 3.0