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appolose said:

The source of my definitions (where I got the idea of things to define) is of no consequence.

I disagree.

I submit to you that, according to the views you've espoused, there's no way to distinguish between the judgements that you claim to be able to make with certainty (definitions, logic, and so on) and a judgement such as "the sky is blue."

Why can't definitions, logic, et al., come from the same place as my determination that the sky is blue?  Why is there any particular reason to parse it out into two different camps, one certain, the other nothing but assumption?

You can't question definition without using it. 

I'd also say that you can't question judgements on sensory data without making them.  It is via sensory data that we are aware that there is such a category.