The task of this paper is to provide what is necessary for a conceptual analysis of toleration such that one would have a clear definition of this central liberal tenet. First, notions related to but different from toleration are discussed; this provides guidance by introducing the likely definitional conditions of toleration. Next, those conditions are explicated and defended. Putting the conditions together, we can say an agent tolerates when she intentionally and on principle refrains from interfering with an opposed other (...) (or their behavior, etc.), though she believes she has the power to interfere. This definition is neither normatively loaded nor sufficient for moral or political theory. Readers may also prefer a definition made with some subset of the conditions rather than all. (shrink)