A body; a complete collection of writings on any subject. The Corpus Iuris Civilis is the collection of Roman Christian laws. The Corpus Iuris Canonici includes the "Decretals" of Gregory IX, Boniface VIII, and Clement V, the "Decree" of Gratian, the "Extravagantes" of John XXII, and the "Extravagantes communes." In law, corpus delicti (Latin: body of the crime) means the aggregate elements which constitute a particular fact a crime.