Discourse/ˈdɪskɔːrs/ Definition 1 of 4Pro Tip 1/2Lengthy Monologue Use 'discourse' when referring to an extended speech which one person dominates. The professor's discourse seemed unending. Pro Tip 2/2Subject Depth 'Discourse' implies a deep exploration of a subject, not just a casual chat. His discourse covered the history of the Roman Empire.