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The essay shows the main conceptions upon a biological power of a word: the macchiavellian theory/ theory of a lie, the mating mind theory, that means a theory of handicaps, and the social  selection theory  of  S.  Dunbar.  The  author  proposes  a  thesis  that  a  speech  takes  its power from the biological determinants of the origin of a language, and proves it by fusing various contemporary biological concepts. It is a biological evolution that founds the power of words, and also explains the magic of words in the  various types of relations – among society, but also between sexes, generations and finally, among individuals considered in a biological sense.