Pronunciation: (dī'u-gram"),[key] —n., v.,-gramed or -grammed, -gram•ing or -gram•ming.
—n. 1. a figure, usually consisting of a line drawing, made to accompany and illustrate a geometrical theorem, mathematical demonstration, etc.
2. a drawing or plan that outlines and explains the parts, operation, etc., of something: a diagram of an engine. 3. a chart, plan, or scheme.
—v.t. to represent by a diagram; make a diagram of.