augment

verb

1. (transitive)To increase; to make larger or supplement.

   “The money from renting out a spare room can augment a salary.”

2. (intransitive, reflexive)To grow; to increase; to become greater.
3. To slow the tempo or meter, e.g. for a dramatic or stately passage.
4. To increase an interval, especially the largest interval in a triad, by a half step (chromatic semitone).
5. (transitive)To add an augment to.

noun

1. A grammatical prefix

   “The augment is found in Greek, Indo-Iranian, Armenian and Phrygian.”

2. A grammatical prefix

   “Fundamentally the augment characterizes a verbal action viewed from a non-contemporary standpoint, either the moment of speaking (or writing) or a further verbal action.”

3. A grammatical prefix
4. An increase.