Aristotle's Poetics defines poetry as imitation.
So statement A is correct.
The Greek word for imitation is:
\[
\text{mimesis}.
\]
So statement C is correct.
Imitation or mimesis is used in literary theory to explain the nature of literature and other arts.
So statement E is also correct.
Statement B is incorrect because imitation is not coined from the word ‘imagism'.
Statement D is also incorrect because it does not define imitation in Aristotle's theory.
Therefore, the correct statements are:
\[
A,\ C,\ E.
\]
Hence, the correct answer is option (B).