The act of illustrating; the act of making clear and distinct; / The state of being illustrated, or of being made clear and distinct.

plural of illustration

Serving to illustrate.

In an illustrative manner.

(obsolete) illustrious

(obsolete) To illuminate / (obsolete) To make illustrious

a person who draws pictures (especially illustrations in books or magazines)

(obsolete) To shed light upon. / (figuratively) To clarify something by giving, or serving as, an example or a comparison.

simple past tense and past participle of illustrate

(historical) A newspaper featuring illustrations.