What is in excelsis deo?

"In Excelsis Deo" is a Latin phrase that translates to "in the highest to God" or "glory to God in the highest." It is part of a traditional Christian hymn called the "Gloria," which is often used in liturgical services, particularly in the Catholic Mass but also in some other Christian denominations. The full phrase "Gloria in excelsis Deo" is meant to express praise and adoration to God and has been set to music by various composers throughout history, becoming a central part of many celebrations, especially during Christmas.

Additionally, "In Excelsis Deo" is the title of an episode from the first season of the television series "The West Wing." This episode, which aired in December 1999, deals with a variety of political and personal issues faced by the staff of the fictional White House, with themes that echo the spirit of the holiday season.

If you were referring to something else specific by "in excelsis deo," such as a particular piece of music, event, or work of art, feel free to provide more context, and I can offer more detailed information.