This document discusses the definitions and measurement of psychological literacy (PsyLit). It reviews how PsyLit has been defined over time, from early definitions focusing on core psychological concepts to more recent definitions incorporating nine qualities like applying psychology principles and communicating effectively. The document also examines different approaches that have been used to measure PsyLit, such as rating scales of concepts and multi-item surveys assessing domains like reflective thinking. Overall, the review finds no agreed-upon definition of PsyLit and that further validation is needed for models and measures of this construct.