Sentence:  Accordingly , it is the aim of this essay to advance a new theory of imitation ( which I shall call <WSD>mimesis</WSD> in order to distinguish it from earlier theories of imitation ) and a new theory of invention ( which I shall call symbol for reasons to be stated hereafter ) . 
Meaning of the word marked with <WSD> tags:  the imitative representation of nature and human behavior in art and literature