augment

Short definition from Wiktionary

Verb

1. 1
   To increase; to make larger or supplement.
2. 2
   To grow; to increase; to become greater.
3. 3
   To slow the tempo or meter, e.g. for a dramatic or stately passage.
4. 4
   To increase an interval, especially the largest interval in a triad, by a half step (chromatic semitone).
5. 5
   To add an augment to.

Noun

1. 1
   A grammatical prefix: In some languages, a prefix *é- (अ- (a-) in Sanskrit, ἐ- (e-) in Greek) indicating a past tense of a verb.
2. 2
   A grammatical prefix: Especially Old Irish, a preverb, usually ro-, used to give a verb a resultative or potential meaning.
3. 3
   A grammatical prefix: In some languages, an additional vowel prepended to the noun prefix.
4. 4
   An increase.