Webster's Revised Unabridged Dictionary · 1913

Diagram

Diagram , noun

[Greek diagra`mma, from diagra`fein to mark out by lines; dia` through + gra`fein to draw, write: compare French diagramme. See Graphic.]

1.
(Geometry) A figure or drawing made to illustrate a statement, or facilitate a demonstration; a plan.
2.
Any simple drawing made for mathematical or scientific purposes, or to assist a verbal explanation which refers to it; a mechanical drawing, as distinguished from an artistical one.
Collocations (1)
Indicator diagram (Steam Engine) , See Indicator card, under indicator

Diagram , transitive verb

To put into the form of a diagram.