to make (something) or become greater, more numerous, larger, or more intense
to make (a musical interval) a semitone greater than major or perfect
an augmented fourth
to add an augment to (a verb)
to become augmented
augmentable adj
augmentation noun
augmented adj
augmenter noun
augmentor noun
[Middle English augmenten via Old French from late Latin augmentare to increase, from augmentum increase, from Latin augēre to increase]