Sentence:  Accordingly , it is the aim of this essay to advance a new theory of imitation ( which I shall call mimesis in order to distinguish it from earlier theories of <WSD>imitation</WSD> ) 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 doctrine that representations of nature or human behavior should be accurate imitations