to enlarge or increase in size, amount, or degree; to swell; to make bigger; as, to augment an army by reeforcements; rain augments a stream; impatience augments an evil.-to add an augment to.-to increase; to grow larger, stronger, or more intense; as, a stream augments by rain.-enlargement by addition; increase.-a vowel prefixed, or a lengthening of the initial vowel, to mark past time, as in greek and sanskrit verbs.