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[dahy-uh-gram] /ˈdaɪ əˌgræm/
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.
Origin of diagram
1610-20; < Latin diagramma < Greek: that which is marked out by lines. See dia-, -gram1
Related forms
diagrammable, adjective
misdiagrammed, adjective
undiagramed, adjective
undiagrammed, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for diagram
Contemporary Examples
Historical Examples
  • Draw a diagram representing the circumference line and pitch in feet.

    Flying Machines W.J. Jackman and Thos. H. Russell
  • Mark, however, said he would teach him the lay of the case that evening from a diagram.

    Cleo The Magnificent

    Louis Zangwill
  • And this is most clearly shown when he is taken to a diagram or to anything of that sort.

    Phaedo Plato
  • Making the pelvis loop may be easily followed in diagram in Fig. 17.

    Taxidermy Leon Luther Pray
  • The reason for this is best described with the aid of a diagram.

    Submarine Warfare of To-day Charles W. Domville-Fife
British Dictionary definitions for diagram


a sketch, outline, or plan demonstrating the form or workings of something
(maths) a pictorial representation of a quantity or of a relationship: a Venn diagram
verb -grams, -gramming, -grammed (US) -grams, -graming, -gramed
to show in or as if in a diagram
Derived Forms
diagrammatic (ˌdaɪəɡrəˈmætɪk) adjective
diagrammatically, adverb
Word Origin
C17: from Latin diagramma, from Greek, from diagraphein, from graphein to write
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for diagram

1610s, from French diagramme, from Latin diagramma, from Greek diagramma "geometric figure, that which is marked out by lines," from diagraphein "mark out by lines, delineate," from dia- "across, out" (see dia-) + graphein "write, mark, draw" (see -graphy). The verb is 1840, from the noun.

Online Etymology Dictionary, © 2010 Douglas Harper
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