1. Geom. 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. Steam Engine See Indicator card, under indicator
Di·a·gram, v. t. To put into the form of a diagram.
n : a drawing intended to explain how something works; a drawing
showing the relation between the parts
v : make a schematic or technical drawing of that shows how
things work or how they are constructed [syn: plot]
[also: diagramming, diagrammed]