Mapping Existential Loneliness: A Scoping Review on Existential Loneliness/Isolation Conceptualizations and Operationalizations

In the last decade, there has been a renewed interdisciplinary interest in the study of existential loneliness (EL) or existential isolation (EI). However, to date, there is still no consensus in the literature on what exactly EL/EI is and how should be measured, resulting in a wide variety of definitions and operationalizations of the experience. Therefore, this scoping review provides an overview of the available terminology, definitions, and operationalizations of EL/EI. As part of the review corpus, a total of 121 reports out of 12 databases were included. In the text, first, an examination of the terms and conceptualizations commonly used to discuss EL/EI is provided. Second, key components of the available definitions in the literature are listed. Third, most common operationalizations of EL/EI are described. Taking this into account, this scoping review sheds light on how the variety of conceptualizations of EL/EI leads to significant differences in the operationalization of the experience, fostering the development of academic niches and the fragmentation of EL/EI scientific knowledge. Thus, this review is an attempt to map commonalities in the EL/EI literature that may enable the reader to understand what exactly it means to explore the existential dimension of loneliness.