Exemplification, n.
1. The act of exemplifying; a showing or illustrating by example.
2. That which exemplifies; a case in point; example.
3. (Law)
A copy or transcript attested to be correct by the seal of an officer having custody of the original.
Shades of meaning
Fernald has no entry of its own for exemplification; he lists it under example, sample.
Where he writes about it:
An exemplification is an illustrative working out in action of a principle or law, without any reference to its being copied or repeated; an example guides, an exemplification illustrates or explains. — from example