Abstract
Spirituality is a contentious concept in the social sciences. This is above all due to the increasing number of different definitions of spirituality that are used in the field. Some scholars argue that given this heterogeneity, spirituality is not an analytic concept. Scholars use the concept to denote forms of belief that are not part of conventional religiosity. Therefore, spirituality refers to transformations of religion in modern societies. This paper shows that spirituality is generally defined in relation to religion or religiosity. Thus, different concepts of spirituality can be distinguished according to the way they draw the boundaries between religiosity and spirituality. This approach reveals the most important communalities and differences of different perspectives on spirituality as a scientific concept which allows a better assessment of empirical results from research on spirituality.