Webster's Revised Unabridged Dictionary · 1913

Illustrate

Illustrate , transitive verb

[Latin illustratus, past participle of illustrare to illustrate, from illustris bright. See Illustrious.]

1.
To make clear, bright, or luminous.
Here, when the moon illustrates all the sky. — Chapman
2.
To set in a clear light; to exhibit distinctly or conspicuously. — Shakespeare
To prove him, and illustrate his high worth. — Milton
3.
To make clear, intelligible, or apprehensible; to elucidate, explain, or exemplify, as by means of figures, comparisons, and examples.
4.
To adorn with pictures, as a book or a subject; to elucidate with pictures, as a history or a romance.
5.
To give renown or honor to; to make illustrious; to glorify. [Obsolete]
Matter to me of glory, whom their hate Illustrates. — Milton

Illustrate , adjective

[Latin illustratus, p. p.]

Illustrated; distinguished; illustrious. [Obsolete]
This most gallant, illustrate, and learned gentleman. — Shakespeare