Definition of diagram in English:



  • 1A simplified drawing showing the appearance, structure, or workings of something; a schematic representation.

    ‘a diagram of the living room’
    • ‘Follow the manufacturer's wiring diagram to make the connection to your power supply.’
    • ‘On the second point, I think the member has heard the explanation many times before: a graph or a diagram appeared in a document that was not authorised by the Prime Minister or me.’
    • ‘The system can be used to display schematic diagrams of the aircraft's principal sub-systems.’
    • ‘A diagram of the hillside structure is shown on Page 82.’
    • ‘The diagrams illustrating the normal histology of the spleen are comprehensible and significantly clarify a fairly complicated system.’
    • ‘For every birdhouse, you'll find a photo, an exploded diagram of all sides, and simple instructions.’
    • ‘The book is profusely illustrated, with diagrams showing clearly the techniques described.’
    • ‘They are packed with detail but it doesn't seem overwhelming because the pages are broken up with masses of superb colour photographs, maps, street-by-street diagrams and drawings.’
    • ‘A summary flow diagram of patients enrolled in the study is depicted in Figure 1.’
    • ‘Schematic diagrams of the probe and of the entire spectroscopy system are shown in Fig.1.’
    • ‘The text is well illustrated with excellent diagrams, sketches and figures.’
    • ‘The dissertation is well organized with many fascinating diagrams, charts and figures.’
    • ‘In the following paragraphs I will use four simple diagrams to present the argument.’
    • ‘The first weeks of the course deal with electronic principles, electrical-current theory, and the skills needed to interpret equipment diagrams and schematics.’
    • ‘The text also includes many diagrams of molecular structures and points out the relevance and importance of the chemical structure to the pharmacological action.’
    • ‘The data are summarized in the schematic diagram below.’
    • ‘Line drawings and diagrams in the text figures are typically well designed and informative.’
    • ‘Apart from the run-of-the-mill stuff like e-mail and word processing, he is teaching himself to use the computer to draw schematic diagrams.’
    • ‘Fig.14 shows schematic diagrams representing this type of situation.’
    • ‘This diagram shows the complex structure of Saturn's magnetosphere.’
    drawing, line drawing, illustration, picture, artist's impression
    schematic representation, representation, scale drawing, technical drawing, plan, figure, sketch, draft, outline, delineation, exploded view, cutaway, layout
    View synonyms
    1. 1.1Geometry
      A figure composed of lines that is used to illustrate a definition or statement or to aid in the proof of a proposition.
      • ‘Along with many line diagrams and equations, the problems and ‘mathematical meanderings’ strengthen concepts in each chapter.’
      • ‘Stefan handed some chalk to Spencer who began drawing various diagrams on the board.’


  • Represent (something) in graphic form.

    ‘the experiment is diagramed on page fourteen’
    • ‘Take note of all important aspects of the collision and then if possible diagram the exact position of the vehicles before and after the accident.’
    • ‘The screening method is diagrammed in Fig 1A and represents a modification of the crossing design of COYNE et al. 1998.’
    • ‘This simplified figure fails to show the interrelationship between those two processes and unrealistically diagrams the recombination as reciprocal.’
    • ‘He also diagrams the road graph that gives rise to this state of affairs.’
    • ‘The Kensico Cemetery burial card diagrams the wedge-shaped plot, 5 feet by 8 by 40.’
    • ‘Our experimental set-up is diagrammed in Figure 2A.’
    • ‘Unfortunately, this way of diagramming the results tends to lull us into thinking that all the evolutionary changes occurred at those nodes, and none along the branches.’
    • ‘He assembled all the helicopter crews and briefed them on the mission, diagramming the procedure on butcher-block paper.’
    • ‘In terms of the competition of routes, he diagrammed cases where more roundabout routes may be economically defensible.’
    • ‘He diagrammed it on a piece of paper, then shared it with Nick Scheele and Jim Padilla.’
    • ‘Fig 1A.2 diagrams the G matrix and PCs associated with two populations, both of which have the modules diagrammed in Fig 1A.1.’
    • ‘This coordinated ECR model is diagrammed in Fig 5.’
    • ‘By diagramming actual people in actual relationships, we are introducing both mechanical and conceptual problems.’
    • ‘In the heat of the action, the coach eagerly diagrams a play and talks his players through it.’
    • ‘I might instead attempt to diagram its structure, insofar as I am able to apprehend it.’
    • ‘There assistants corrected the proportions of the initial sketches in carefully diagrammed drawings and clay models so they conformed to the perfect mathematical ratios.’
    • ‘Although only three lineages are diagrammed, in reality an average of >100 lineages were propagated for each genotype.’
    • ‘It is an attempt to diagram the allies, enemies, cousins, straw men, party followers, puppets, and courtiers and their relationships.’
    • ‘All we see are coaches discussing certain planned options, not actually diagramming the procedures for us.’
    • ‘A genetic map showing the 16 chromosomes of yeast is diagrammed.’


Early 17th century: from Latin diagramma, from Greek, from diagraphein mark out by lines from dia through + graphein write.