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1. A plan, sketch, drawing, or outline designed to demonstrate or explain how something works or to clarify the relationship between the parts of a whole.
2. Mathematics A graphic representation of an algebraic or geometric relationship.
3. A chart or graph.
tr.v. di·a·grammed, di·a·gram·ming, di·a·grams or di·a·gramed or di·a·gram·ing
To indicate or represent by or as if by a diagram.
[Latin diagramma, figure, from Greek, a figure worked out by lines, plan, from diagraphein, to mark out, delineate : dia-, dia- + graphein, to write; see gerbh- in Indo-European roots.]
di′a·gram·mat′ic (-grə-măt′ĭk), di′a·gram·mat′i·cal adj.