/ ˈdaɪəgræm; NAmE / noun
a simple drawing using lines to explain where sth is, how sth works, etc. :
a diagram of the wiring system
The results are shown in diagram 2.
► dia·gram·mat·ic / ˌdaɪəgrəˈmætɪk; NAmE / adjective
► dia·gram·mat·ic·al·ly / -kli; NAmE / adverb
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WORD ORIGIN
early 17th cent.: from Latin diagramma , from Greek , from diagraphein mark out by lines, from dia through + graphein write.