Although hyponymy is a common sense-relation,its definition is often taken for granted.Hence repeated confusion or ambiguity,even among linguists.The present study strives to tell the intension and extension of hyponymy,which are the core of the casual assumption involved in the definition of hyponymy,as maximally apart so as to restore the linguistic nature of hyponymy analysis. Although hyponymy is a common sense-relation, its definition is often taken for granted.Hence repeated confusion or ambiguity, even among linguists. The present study strives to tell the intension and extension of hyponymy, which are the core of the casual assumption involved in the definition of hyponymy, as maximally apart so as to restore the linguistic nature of hyponymy analysis.