Defining, understanding, explaining the phenomenon of religiosity, and its revealing the effects on the individual with its different dimensions is one of the basic study topics of the psychology of religion. However, the multi-dimensional and complex structure of religiosity brings with it a number of difficulties in the definition and conceptualization. In order to understand the phenomenon of religiosity from past to present, many definitions and conceptions have been made. Especially theology, philosophy, social sciences, etc. many different areas have shown interest in the subject within the framework of their perspectives. In the definition of religiosity; in addition to the sociological contexts such as religion, tradition, and culture, there is also the psychological context that has been considered concerning the perception of religion on the individual level and how religion is experienced. Therefore, there are many definitions of religiosity in the literature, which are made by different disciplines according to different dimensions and different contexts.