Hispanic-Serving Institutions (HSIs) are colleges and universities that enroll at least 25% Latinx students. Despite being recognized by the federal government since 1992, HSIs lack a historical mission to serve Latinxs. As such the idea of "servingness" has become an elusive concept. An abundance of literature centering HSIs has been published, yet there continues to be a debate about what it means to serve students. We conducted a systematic review of 148 journal articles and book chapters to better understand how researchers conceptualize the idea of servingness at HSIs. We identified four major themes used by researchers to conceptualize servingness: (1) outcomes, (2) experiences, (3) internal organizational dimensions, and (4) external influences. We also found that researchers are often unintentional in their efforts to conceptualize what it means to be an HSI. We offer a multidimensional conceptual framework of servingness to be used in research, policy, and practice.