Note 145a

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.

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