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A biblical concordance is an index of all (significant) words within the Hebrew and/or Christian Scriptures, listed along with their immediate verbal contexts, with references to the location (book, chapter, and verse) of each word. Such a tool is handy for finding only dimly recalled verses and also for deepening understanding of biblical word use.
Biblical concordances are matched to specific languages (e.g., Greek, German, English) and translations (e.g., Douey, King James, RSV, NAB, etc) of the Hebrew and the Christian Scriptures.
These days, the easiest way to track down multiple uses of terms is through a digital form of the Bible, something as simple or as complex as Bibleworks (version 6 is available in Woodstock Theological Center Library). The paper editions here, however, still work.