Augment

Part of speech: noun (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.

Part of speech: verb (v.)

1. To enlarge or increase in size, amount, or degree; to swell; to make bigger; as, to augment an army by reëforcements; rain augments a stream; impatience augments an evil. But their spite still serves His glory to augment. Milton.

2. To add an augment to.

Part of speech: verb (v.)

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