正せいと反はんMeanings1expressionthesis and antithesisA set phrase from dialectical reasoning, contrasting a proposition with its opposite. Used in formal or academic contexts.弁べん証しょう法ほうでは、正せいと反はんの対たい立りつから合ごうが生うまれる。In dialectics, synthesis arises from the opposition of thesis and antithesis.