In the present paper, I analyze the terminology John Locke used in his description of experience. Although he makes idea the principal term, also image , impression , and notion frequently appear in his Essay . Their meanings and interrelations are rooted in the seventeenth-century discussion in post-Cartesian philosophy which was the reason for using them in various contexts by Locke. Additionally, I suggest that three different approaches to experience can be found intermingling in Locke’s Essay : the commonsensical, the psychological, and the psychological one. Depending on a perspective taken in various parts of the work, they complement one another. Distinguishing them makes it possible to appreciate the coherence of Locke’s philosophy...