\Te De"um\
A musical setting of the Te Deum.

\Te` De"um\ [L., from te (accus. of tu thou) + Deum,
accus. of Deus God. See {Thou}, and {Deity}.]
1. 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.

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