augment

v. t.

  1. 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.
  2. To add an augment to.

v. i.

  1. To increase; to grow larger, stronger, or more intense; as, a stream augments by rain.

n.

  1. Enlargement by addition; increase.
  2. A vowel prefixed, or a lengthening of the initial vowel, to mark past time, as in Greek and Sanskrit verbs.