Etymology
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illustrate (v.)

1520s, "light up, shed light on;" 1610s, "educate by means of examples," back-formation from illustration, and in some cases from Latin illustratus, past participle of illustrare "light up, make light, illuminate." Sense of "provide pictures to explain or decorate" is 1630s. Related: Illustrated; illustrating.

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Definitions of illustrate

illustrate (v.)
clarify by giving an example of;
Synonyms: exemplify / instance
illustrate (v.)
depict with an illustration;
illustrate (v.)
supply with illustrations;
illustrate a book with drawings
From wordnet.princeton.edu