The subjects focused on in this article are dalalat (indication) of almutaabaqah (conformity), al-tadammun (inclusion) and al-iltizaam (commitment). The scholar who divided the dalalat concepts into three categories in this manner was Ibn Sina. Mutaqabah, which is one of the concepts that manifested in relation to the issue of definition, stands for the exact dalalat of the whole meaning in which lafz (the word) is indicated; while tadammun corresponds to a part of the meaning in which lafz is indicated. As for iltizam, it is out of the meaning of lafz but is a dalalat that is in relation to its meaning. The entry of these concepts into Usûl al Fiqh (which literally means the roots of the law) occurred, again in the context of definition, with the introduction of logic written by Ghazali in alMustasfa. Since Ghazali considered the necessity of using the principles of definition in mantiq (logic) to describe religious terms, he allowed forsuch dalalat that are a part of the theory of definition. However, Razî added a different dimension to this matter by adapting these concepts into the dalalat of the words. Razî dealt with all of the issues within the context of mantuq (the mentioned) such as order, prohibition, apparent (dhahir), explit text (nass) and concise within the frame of dalalat al-mutaabaqah and he evaluated dalalat types such as iktiza (need), mafhum al- muwafaqah (congruent meaning), mafhum al-mukhalafa (divergent meaning) that are in the frame of the sign of mafhum in the context of dalalat aliltizaam (committed dalalat). He did not give place to dalalat al-tadammun (included sign) within the context of lafz. In this article, we will deal with this issue within the framework of the three authors in terms of fiqh methodology (Usûl al Fiqh).