An ancient and celebrated Christian hymn, of uncertain
   authorship, but often ascribed to St. Ambrose; -- so called from the
   first words "Te Deum laudamus." It forms part of the daily matins of
   the Roman Catholic breviary, and is sung on all occasions of
   thanksgiving. In its English form, commencing with words, "We praise
   thee, O God," it forms a part of the regular morning service of the
   Church of England and the Protestant Episcopal Church in America.