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English definition of “illustration”

illustration

noun [C or U] uk   /ˌɪl.əˈstreɪ.ʃən/ us  

illustration noun [C or U] (EXAMPLE)

C2 an example that explains or proves something: This delay is a perfect illustration of why we need a new computer system. A couple of examples are included, by way of illustration (= to show the meaning more clearly).Samples and examples

illustration noun [C or U] (PICTURE)

C1 a picture in a book, magazine, etc. or the process of illustrating something: a full-page illustration colour/black and white illustrationsPictures
(Definition of illustration from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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