Introduction: Applied epistemology allows information studies to benefit from developments in philosophy. In information studies, epistemic concepts are rarely considered in detail. This paper offers a review of several epistemic concepts, focusing on understanding, as a call for further work in applied epistemology in information studies. Method: A hermeneutic literature review was conducted on epistemic concepts in information studies and philosophy. Relevant research was retrieved and reviewed iteratively as the research area was refined. Analysis: A conceptual analysis was conducted to determine the nature and relationships of the concepts surveyed, with an eye toward synthesizing conceptualizations of understanding and opening future research directions. Results: The epistemic aim of understanding is emerging as a key research frontier for information studies. Two modes of understanding (hermeneutic and epistemological) were brought into a common framework. Conclusions: Research on the concept of understanding in information studies will further naturalistic information research and provide coherence to several strands of philosophic thought.