noun (n)

• a harmonious state of things in general and of their properties (as of colors and sounds); congruity of parts with one another and with the whole(noun.state)

  Synonym:
  concord, harmony
  

  source: wordnet30
• agreement of opinions(noun.communication)

  source: wordnet30
• an index of all main words in a book along with their immediate contexts(noun.communication)

  source: wordnet30
• Agreement; accordance.(noun)

  source: webster1913