Abstract
Study of reasons and backgrounds of appearance of Hadith terminology as well as its evoluation is so significant. Because some opponents of Hadith terminology believe that the foundation and source of this science has generated from Sunni sect, that's why this science is blameful innovation and in result, they reject the division of Hadith to four part i.e. authentic Hadith (Sahih), weak Hadith (Zaeef), acceptable Hadith (Hasan) and reliable Hadith (Movassaq).This paper is going to shows that there are most of these expressions and terms in prior Shiite works and about some of them it is possible to say that their meaning is different than what Shiite believe.
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