<p><strong>Noun</strong></p><ul><li>A figure, usually consisting of a line drawing, made to accompany and illustrate a geometrical theorem, mathematical demonstration, etc.</li><li>A drawing or plan that outlines and explains the parts, operation, etc., of something: a diagram of an engine.</li><li>A chart, plan, or scheme.</li></ul><p><strong>Verb</strong></p><ul><li>To represent by a diagram; make a diagram of.</li></ul>