 For these reasons and others, philosophers have had much to say, initially in passing and now at length, about what disability is and what “disability” means. This entry will discuss both issues—first, detailing philosophical engagement with longstanding debates over the correct “model” or general framework for understanding disability as a phenomenon; second, asking how philosophers have come to understand the meaning of concepts denoted by words like “disability” and “impairment”, as those have been used in various empirical and normative discourses concerning people with disabilities.