Source : Webster's Revised Unabridged Dictionary (1913)

Concordance \Con*cord"ance\, n. [F., fr. LL. concordantia.]
   1. Agreement; accordance.

            Contrasts, and yet concordances.      --Carlyle.

   2. (Gram.) Concord; agreement. [Obs.] --Aschlam.

   3. An alphabetical verbal index showing the places in the
      text of a book where each principal word may be found,
      with its immediate context in each place.

            His knowledge of the Bible was such, that he might
            have been called a living concordance. --Macaulay.

   4. A topical index or orderly analysis of the contents of a
      book.

Source : WordNet®

concordance
     n 1: 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 [syn: {harmony}, {concord}]
     2: agreement of opinions [syn: {harmony}, {concord}]
     3: an index of all main words in a book along with their
        immediate contexts