There is not yet consensus in the field on what constitutes a ``foveated display''. We propose a compromise between the perspectives of rendering, imaging, physiology and vision science that defines a foveated display as a display designed to function in the context of user gaze. This definition enables us to describe 2 axes of foveation, gaze interaction and resolution distribution, which we then subdivide to provide useful categories for classification. We view this proposal as the start of a discussion among the community rather than a final taxonomy.