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. Indicator diagram.

<engineering> See Indicator card, under indicator

Origin: Gr, fr. To mark out by lines; through + to draw, write: cf. F. Diagramme. See Graphic.

(01 Mar 1998)