augment (v.)

late 14c., "become more severe;" c. 1400, "to make larger; become larger," from Old French augmenter "increase, enhance" (14c.), from Late Latin augmentare "to increase," from Latin augmentum "an increase, growth," from augere "to increase, make big, enlarge, enrich," from PIE root *aug- (1) "to increase." Related: Augmented; augmenting. As a noun from early 15c.