A sermon is a religious discourse or oration by a preacher or other member of clergy. Sermons address a scriptural, theological, or moral topic, usually expounding on a type of belief, law, or behavior within both past and present contexts. Elements of the sermon often include exposition, exhortation, and practical application. The act of delivering a sermon is called preaching. In secular usage, the word sermon may refer, often disparagingly, to a lecture on morals.
In Christian practice, a sermon is usually preached to a congregation in a place of worship, either from an elevated architectural feature, known as a pulpit or an ambo, or from behind a lectern. The word sermon comes from a Middle English word which was derived from Old French, which in turn originates from the Latin word sermō meaning ‘discourse.’ A sermonette is a short sermon (usually associated with television broadcasting, as stations would present a sermonette before signing off for the night). The Christian Bible contains many speeches without interlocution, which some take to be sermons: Jesus’ sermon on the mount in Matthew (though the gospel writers do not specifically call it a sermon; the popular descriptor for Jesus’ speech there came much later); and Peter after Pentecost in Acts 2:14–40(though this speech was delivered to non-Christians and as such is not quite parallel to the popular definition of a sermon).
Local parishes of the Roman Catholic Church, like episcopal parishes, favor formal worship styles, and still more traditional structure in services. The importance of formal office is also a distinctive trait; thus a solemn mass may include the presence of officers of the Knights of Columbus as an escort for the regional bishop when he is present. Likewise, vestments are valued to inculcate the solemnity of the Holy Eucharist and are typically more elaborate than in other churches.