Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Language: Greek
Origin: diagramma, from diagraphein 'to mark out with lines'

diagram

1 noun
     
di‧a‧gram1 [countable]
AV a simple drawing or plan that shows exactly where something is, what something looks like, or how something works
diagram of
a diagram of the heating system
—diagrammatic adjective
—diagrammatically adverb
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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