(ancient Greece) a hymn of praise (especially one sung in ancient Greece to invoke or thank a deity)

A song of celebration.

a joyous song or hymn of praise, tribute, thanksgiving, or triumph Source

A ritual exclamation and name for the song addressed to gods of healing (originally Paean, later Apollo and Asclepius). Paeans were sung at religious festivals, during illness or plague, before a military action, after libations, and on public occasions like the ratification of peace.

Paean is a term used to describe a type of song. It comes from the ancient Greek use of the term, which was also used as the name of the healer of the gods.