Oration

An elaborate discourse, delivered in public, treating an important subject in a formal and dignified manner; especially, a discourse having reference to some special occasion, as a funeral, an anniversary, a celebration, or the like; -- distinguished from an argument in court, a popular harangue, a sermon, a lecture, etc.; as, Webster's oration at Bunker Hill.

To deliver an oration.

an instance of oratory; "he delivered an oration on the decline of family values"