1. to make larger; enlarge in size, number, strength, or extent; increase: His salary is augmented by a small inheritance.
a. to raise (the upper note of an interval or chord) by a half step.
b. to double the note values of (a theme): In the fugue's development the subject is augmented.
3. Gram.to add an augment to.
4. Heraldry.to grant an augmentation to (a coat of arms).
to become larger.
Gram.a prefixed vowel or a lengthening of the initial vowel that characterizes certain forms in the nonpresent inflection of verbs in Greek, Sanskrit, Armenian, and Phrygian.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.