Te Dē'um

[Lat.] 1. An ancient and celebrated Christian hymn, composed by St. Ambrose, and often sung in churches on Sundays, or days of special worship or thanksgiving; — so called from the first words, “Te Deum laudamus” — We praise thee, O God.

2Sense 2. Hence, a religious service of thanksgiving in which the singing of the hymn Te Deum laudamus forms a principal part.