oration

1. (humorous) A lengthy speech or argument in a private setting.Examples: "My Landlord was likewiſe beginning his Oration to Jones, but was preſently interrupted by that generous Youth, who ſhook him heartily by the Hand; and aſſured him of entire Forgiveneſs […]"; "Sally bustled off to set on the kettle for tea, and felt half ashamed, in the quiet of the kitchen, to think of the oration she had made in the parlour."; "The supper things cleared away, Gerald resumed his oration, but with little satisfaction to himself and none at all to his audience."Synonyms: lecture, spielhumorous

2. (Catholicism) A specific form of short, solemn prayer said by the president of the liturgical celebration on behalf of the people.