The faculty or act of speaking. The faculty or act of expressing or describing thoughts, feelings, or perceptions by the articulation of words. What is spoken or expressed, as in conversation; uttered or written words: seditious speech. A talk or public address, or a written copy of this: The senator gave a speech. The language or dialect of a nation or region: American speech. One's manner or style of speaking: the mayor's mumbling speech. The study of oral communication, speech sounds, and vocal physiology.