Definify.com
Webster 1913 Edition
Illustration
Ilˊlus-tra′tion
,Noun.
[L.
illustratio
: cf. F. illustration
.] 1.
The act of illustrating; the act of making clear and distinct; education; also, the state of being illustrated, or of being made clear and distinct.
2.
That which illustrates; a comparison or example intended to make clear or apprehensible, or to remove obscurity.
3.
A picture designed to decorate a volume or elucidate a literary work.
Webster 1828 Edition
Illustration
ILLUSTRA'TION
,Noun.
1.
Explanation; elucidation; a rendering clear what is obscure or abstruse.