أن لا يكون صدق ذلك المعنى العام في جميع أفراده على وجه الاستواء
The common meaning does not apply to all of its instances in precisely the same manner.
This is called mushakkik, a graded universal. The book discusses difference through priority, precedence, intensity or increase. The meaning remains common, but the manner or degree of its application differs.
Its traditional examples include “existence” predicated of the Necessary and the contingent, and the varying whiteness of snow and ivory. These examples belong to classical philosophical discussions and should be interpreted within those technical distinctions.