Gotthard Gunther introduced the term proemial relation in his 1970 paper "Cognition and Volition". Meaning "to preface", it specifically refers to the intercoherence (prerequisite relation) of subject and object. Subject and object arise together. In fact, 'subject' is a mere abbreviation of 'Subject-superject' which is an 'actual entity' in Alfred North Whitehead's technical phraseology.
The abstractions related are Subjectivity and Profundity. In Gotthard Gunther's mathematics, Subjectivity is called "polycontexturality".
References
Proemial relation Wikipedia(Text) CC BY-SA