In this article, by studying Imamate issue, it has been tried to declare its lexical and idiomatic meanings among Sh’ite and Non-sh’ite. After collecting the most important definitions, based on the effects of each group’s presumption, it is mentioned that although there are some similarities in terms of external and verbal concept, regarding this definition as a priori among Shiats theologians and as a posteriori among Non-Shi’ite theologians, the main difference is obvious. We can also realize the reason of why the Nonshiats theologians are confused, which leads to the contradiction between their definition and their idea when they define Imamate. There is also contradiction in their act with what they define for Imamate.
)