Pronunciation: (kon-kôr'dns, kun-), [key]
1. agreement; concord; harmony: the concordance of the membership.
2. an alphabetical index of the principal words of a book, as of the Bible, with a reference to the passage in which each occurs.
3. an alphabetical index of subjects or topics.
4. (in genetic studies) the degree of similarity in a pair of twins with respect to the presence or absence of a particular disease or trait.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.