a figure, usually consisting of a line drawing, made to accompany and illustrate a geometrical theorem, mathematical demonstration, etc.

a drawing or plan that outlines and explains the parts, operation, etc., of something

a diagram of an engine.

a chart, plan, or scheme.

to represent by a diagram; make a diagram of.

noun

big picture * , blueprint , chart , description , design , draft , figure , floor plan , game , game plan , ground plan , layout , outline , perspective , representation , rough draft , block diagram , cutaway , drawing , exploded view , flow chart , graph , illustration , map , model , pie chart , plan , plat , plot , schema