The Royal Family of Nominalism
In the November 1966 issue of The Objectivist, Ayn Rand wrote:
It might be said that fifty years ago nominalists self-identified as "non-binary definitionists." True and false pertained to propositions, but not definitions. A proposition suggests mere possibility, but a definition suggests actual certainty. And certainty implies knowledge of reality. If the goal is to enslave people's minds, then you certainly don't want to encourage them to pursue knowledge of reality.
Fast forward
But that's not any different than what a nominalist would say. A nominalist might say, sure we have these abstract concepts in our minds. But the issue here is whether they correspond to a real universal which has a true definition, or rather on the contrary that there is nothing universal out in reality for it to correspond to; it's a made up definition which cannot in principle be true or false.
If there is no universal in reality to check a concept or definition against, then they are ju