When Fârâbî says that there are senses of “one” which do not presuppose any plurality and which have no opposite except a bare contradictory—so that there is no sense of “many” opposite to these senses of “one”, although there is a sense of “many” arising from each such sense of “one”—he is interested above all in the sense of “one” as “circumscribed by a quiddity” (first introduced #17). Fârâbî does not assume that the reader will already be familiar with this analysis of a special sense of “on