Augment meaning : (grammar) In some Indo-European languages, a prefix e- (a- in Sanskrit) indicating a past tense of a verb. (grammar) In some Bantu languages, an additional vowel prepended to the noun prefix. An increase. To increase; to make larger or supplement. To grow; to increase; to become greater. To slow the tempo or meter, e.g. for a dramatic or stately passage. To increase an interval, especially the largest interval in a triad, by a half step (chromatic semitone). (grammar) To add an augment to.