augment

noun
  1. 1

    (grammar) In some Indo-European languages, a prefix e- (a- in Sanskrit) indicating a past tense of a verb.

  2. 2

    (grammar) In some Bantu languages, an additional vowel prepended to the noun prefix.

  3. 3

    An increase.

verb
  1. 1

    To increase; to make larger or supplement.

    โ€œThe money from renting out a spare room can augment a salary.โ€

  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

    (grammar) To add an augment to.

Source: https://en.wiktionary.org/wiki/augment