Cicero on the Five Divisions of Oratory

De Inv. 1.7 (LCL, Hubbell)

And these are the divisions of it, as numerous writers have laid them down: Invention; Arrangement; Elocution; Memory; Delivery. Invention, is the conceiving of topics either true or probable, which may make one's cause appear probable; Arrangement, is the distribution of the topics which have been thus conceived with regular order; Elocution, is the adaptation of suitable words and sentences to the topics so conceived; Memory, is the lasting sense in the mind of the matters and words corresponding to the reception of these topics. Delivery, is a regulating of the voice and body in a manner suitable to the dignity of the subjects spoken of and of the language employed.