Dictionary.com
Thesaurus.com

jubilus

American  
[joo-buh-luhs] / ˈdʒu bə ləs /

noun

Liturgy.

plural

jubili
  1. (in Roman Catholic music) a rejoicing, melodic group of tones to which is chanted the last “a” of the second and third alleluias, often following the gradual of the Mass.


Etymology

Origin of jubilus

< Medieval Latin: shout of joy, Latin jūbilum a wild cry, shepherd's song; see jubilate