With growing attention on criminalizing psychological forms of abuse, it is imperative that researchers develop clear and intentional definitions of abstract concepts, like gaslighting. The purpose of this article was to develop a definition of gaslighting by comparing key points of contention in existing literature with the first-hand experiences of victim survivors and support service providers, to enhance future research and practical application of the term in policy and legal contexts. The study used an online open-ended survey to gather data from victim survivors and support service providers about their definitions of gaslighting. Responses were analyzed using qualitative content analysis to identify definitional components of gaslighting. The study identified six key components of gaslighting: behavior, outcomes, intention, repetition, subsidiary tactics, and the role of power and intimacy. The study proposed a definition of gaslighting informed by victim survivor and service provider perspectives, while acknowledging the need for further research to refine controversial components like intention, repetition, and power imbalances. Furthermore, it addresses limitations such as the lack of perpetrator perspectives and the need for more diverse samples in the refinement of future definitions and measurements of gaslighting.