noun.
The act of illustrating, or of rendering clear or obvious; explanation; elucidation; exemplification.
noun.
The state of being illustrated or illumined.
noun.
That which illustrates. Specifically
noun.
A pictorial representation, map, etc., placed in a book or other publication to elucidate the text.
noun.
Illustriousness; distinction.
noun.
In music, same as development