This paper comes as an attempt to discuss an important issue o
Criticism's issues ,that is ; special terms . for, clauses of criticism have acquainted meanings according to Imams (pioneers) of this art . but , for a reason or another , for some of them (Imams of this art) meanings differ from what is acquainted among them .
And the reason of that is the nature of AL-imam in preferring a certain Kind in setting clauses of cnticism . Among these reasons are : flexibility spontaneity and faring away from , sharpness . These reasons lead to the variety of the prominent reason which lead to the variety in meaning derived from certain term, while there is a meaning which has great relation with that term. This subject is chosen in spite of its difficulty . for it reaches its climax in this age.