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A concordance is a reference work that provides an alphabetical index of the principal words in a book or an author's works, showing their immediate contexts. It can also mean agreement or harmony. Dictionaries, which are reference books defining words, may include a concordance if they are an index to a specific body of writing. The term originates from the Latin concordare, meaning "to agree". Concordats, on the other hand, are pacts between ecclesiastical and secular authorities concerning church affairs.1234

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