noun

1. a geometric figure, used to illustrate a mathematical statement, proof, etc.
2. a sketch, drawing, or plan that explains a thing by outlining its parts and their relationships, workings, etc.
3. a chart or graph explaining or illustrating ideas, statistics, etc.

Etymology: Gr diagramma < diagraphein, to mark out by lines, draw < dia- (see dia-) + graphein, to write (see graphic)

transitive verb diagramed -·gramed′ or diagrammed -·grammed′, diagraming -·gram′·ing or diagramming -·gram′·ming