I'm going to disagree somewhat: We have what was once termed "innate ideas" (though I think the accepted concept today is slightly different), which is not really the same thing as a definition. For example, try to define the word "climb". You'll find it very difficult. In fact, I believe many pages in a fairly recent linguistics journal were devoted to this very task, with incomplete results. However, children pick up the concept perfectly. Chomsky goes over this in his *Language and Problems of Knowledge*.
So I'd say that we have to be careful about what we mean by "reality", and how words therefrom derive their definitions. "Reality" is very much built in to our brains in a certain sense, and words and language spring from the growth of the brain/mind while interacting with the environment.
Bill