Meaning of “diagram” in the English Dictionary

"diagram" in British English

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diagramnoun [ C ]

uk /ˈdaɪ.ə.ɡræm/ us /ˈdaɪ.ə.ɡræm/

B1 a simple plan that represents a machine, system, or idea, etc., often drawn to explain how it works:

The teacher drew a diagram showing how the blood flows through the heart.

More examples

  • There are explanatory notes with the diagram.
  • I'd like you to look at the diagram which is halfway down page 27.
  • The lecturer illustrated his point with a diagram on the blackboard.
  • Join the points A and B together on the diagram with a straight line.
  • The first diagram is a view of the shop from the street, and the second shows it in section.
diagrammatic
adjective uk /ˌdaɪ.ə.ɡrəˈmæt.ɪk/ us /ˌdaɪ.ə.ɡrəˈmæt̬.ɪk/
diagrammatically
adverb uk /ˌdaɪ.ə.ɡrəˈmæt.ɪ.kəl.i/ us /ˌdaɪ.ə.ɡrəˈmæt̬.ɪ.kəl.i/

using diagrams:

She explained the whole problem diagrammatically.

(Definition of “diagram” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"diagram" in American English

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diagramnoun [ C ]

us /ˈdɑɪ·əˌɡræm/

a simple plan drawn to represent something, such as a machine, usually to explain how it works or how it is put together:

The teacher drew a diagram showing how blood flows through the heart.

(Definition of “diagram” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"diagram" in Business English

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diagramnoun [ C ]

uk /ˈdaɪəɡræm/ us GRAPHS & CHARTS

a drawing that explains how a system, machine, process, plan, etc., operates or is organized:

As the diagram shows, a complex arrangement has been designed to balance French, German, and Spanish interests.
draw (sb) a diagram of sth The mechanic drew me a diagram of the brake balance.

(Definition of “diagram” from the Cambridge Business English Dictionary © Cambridge University Press)