noun (n)

• the amount by which something increases(noun.event)

  Synonym:
  increase, increment
  

  source: wordnet30
• the statement of a theme in notes of greater duration (usually twice the length of the original)(noun.communication)

  Antonym:
  diminution
  

  source: wordnet30
• the act of augmenting(noun.act)

  source: wordnet30
• The act or process of augmenting, or making larger, by addition, expansion, or dilation; increase.(noun)

  source: webster1913