Abstract
This article illustrates some of the difficulties of defining discrimination and briefly sketches the benefits and desiderata of doing so. It then examines and defines generic direct discrimination as an agent treating two groups differently because of the property that defines one of the groups as a group, in a way that is worse for that group, clarifying each of these three conditions in turn. It considers two arguments for further conditions: that an act must target one among a particular set of groups to constitute discrimination, and that an act must be in some sense morally wrong to constitute discrimination. It concludes that while these objections are forceful it may be the case that they illustrate that we employ multiple, partly overlapping concepts of discrimination, and that it may be more important to recognize this heterogeneity than it is to attempt to establish a dominant or unitary definition.