First mode of per se predication is : The predicate is an element of the real definition of the subject (primo modo dicendi per se).
Second mode of per se predication is : The subject term is an element in the determinate nominal definition [see below] of the predicate (secundo modo dicendi per se).
A typical instance of nominal definition is that of ' the white ' , which is defined as ' something in which whiteness is present ', where the form or principle by which a substance is contingently qualified, is connoted obliquely by the concrete term that is being defined ( ' the white ' ), and is denoted by the abstract counterpart ( ' whiteness ' ) which appears in the nominal definition.
A fully determinate nominal definition, which was sometimes called the "real definition" of a connotative term, states not only what is connoted by the term defined, but also the proximate subject of the accidental determination thus connoted. For example, ' the white ' is determinately defined, through the essential nature of the things for which it can stand, as "a body in which whiteness exists".
While nominal definitions may include a genus, and do so when they are partially or fully determinate (as we saw with the replacement of "something" by "body"), descriptions are composed only of properties and accidents.