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.

A religious service in which the singing of the hymn forms a
principal part.