a figure, usually consisting of a line drawing, made to accompany and illustrate a geometrical theorem, mathematical demonstration, etc.
a drawing or plan that outlines and explains the parts, operation, etc., of something: a diagram of an engine.
a chart, plan, or scheme.
verb (used with object), diagramed or diagrammed, diagraming or diagramming.
to represent by a diagram; make a diagram of.

1610–20; < Latin diagramma < Greek: that which is marked out by lines. See dia-, -gram1

diagrammable, adjective
misdiagrammed, adjective
undiagramed, adjective
undiagrammed, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
diagram (ˈdaɪəˌɡræm)
1.  a sketch, outline, or plan demonstrating the form or workings of something
2.  maths a pictorial representation of a quantity or of a relationship: a Venn diagram
vb , -grams, -gramming, -grammed, -grams, -graming, -gramed
3.  to show in or as if in a diagram
[C17: from Latin diagramma, from Greek, from diagraphein, from graphein to write]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1619, from Fr. diagramme, from L. diagramma, from Gk. diagramma (gen. diagrammatos) "that which is marked out by lines," from diagraphein "mark out by lines, delineate," from dia- "across, out" + graphein "write, mark, draw." The verb is 1840, from the noun.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
No photograph, diagram or drawing had surfaced that showed what was to happen.
Graduation ceremonies vary quite substantially around the world but they tend
  to have this same underlying diagram.
People in different locations can chat to each other as they look at the same
  diagram on their screens.
Have students look at this diagram of a right whale, either online or on paper.
Image for diagram
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