(philosophy) the philosophical doctrine that abstract concepts exist independent of their names WordNet 3.0 & Open English WordNet

Philosophical realism – usually not treated as a position of its own but as a stance towards other subject matters – is the view that a certain kind of thing has mind-independent existence, i.e. that it exists even in the absence of any mind perceiving it or that its existence is not just a mere appearance in the eye of the beholder. Wikipedia

Philosophical concept Wikidata

A doctrine that universals are real—they exist and are distinct from the particulars that instantiate them. Wiktionary