1. simple explanatory drawing: a simple drawing showing the basic shape, layout, or workings of something
2. chart: a chart or graph that illustrates something such as a statistical trend
3. mathematics mathematical drawing: a line drawing that presents mathematical information
transitive verb (past and past participledi·a·grammed or di·a·gramed, present participledi·a·gram·ming or di·a·gram·ing, 3rd person present singulardi·a·grams)
Definition:
information science mathematics illustrate something: to make a diagram that represents or illustrates something
[Early 17th century. Via Latin< Greek diagramma "geometric figure, written list, scale in music" < diagraphein "mark out by lines, draw" < graphein "write"]