Augment

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.