This essay explores the meaning of Kant's transcendental definition of pleasure and displeasure. I will explain the meaning of "definition" and "transcendental" respectively in relation to the feeling of pleasure and displeasure, contrasting with the interpretations of Guyer (2018) and Deimling (2018). Not only will I show how they are wrong, but I will also offer reasons for their misinterpretations. This essay proposes that the transcendental definition of pleasure and displeasure bears more systematic significance in Kant's philosophy than previous researchers (...) might have thought. My analysis also leads back to Kant's conception of the anthropological relation between life, desire, and pleasure. (shrink)