dis·course 
(dĭskôrs′)
(dĭskôrs′)n.
1. Verbal expression in speech or writing: political discourse.
2. Verbal exchange or conversation: listened to their discourse on foreign policy.
3. A formal, lengthy treatment of a subject, either written or spoken.
4. Archaic The process or power of reasoning.
v. (dĭ-skôrs) dis·coursed, dis·cours·ing, dis·cours·es
v.intr.
1. To speak or write formally and at length. See Synonyms at speak.
2. To engage in conversation or discussion; converse: "The two men walked around the city and discoursed on its antiquities" (Michael Wood).
v.tr.
Archaic
Archaic
To narrate or discuss.
[Middle English discours, process of reasoning, from Medieval Latin discursus, from Latin, a running about, from past participle of discurrere, to run about : dis-, apart; see DIS- + currere, to run; see kers- in the Appendix of Indo-European roots.]
dis·courser n.