Nominal vs. net strength

I have difficulty accepting the definition of "nominal strength" and "net strength" given in Shigley's Mechanical Engineering Design.

Consider a plate of width w, thickness t, with a hole of diameter d centered at w/2, loaded with force F.  

Shigley's says: the "net stress" is \sigma_net=F/(wt) and the "nominal stress" is \sigma_nominal=F/((w-d)t). ==> I think he is wrong!

According to: http://dictionary.reference.com/

Net:

— noun

1. remaining after deductions, as for charges or expenses (opposed to gross ): net earnings. ==> my interpretation ==> F/((w-d)t) ==> after deductions!

2. Noun. final; totally conclusive: After all that work, what was the net result?

— adj

3. net income, profit, or the like.

Nominal:

— adj

1. in name only; theoretical: the nominal leader

2. minimal in comparison with real worth or what is expected; token: a nominal fee ==> my interpretation ==> F/(wt) ==> minimal in comparison!

3. of, being, or relating to a designated or theoretical size that may vary from the actual : approximate <the pipe's nominal size> my interpretation ==> F/(wt) ==> obvious parallel to nominal pipe dimensions, which are not actual but nominal!

Do you agree/disagree w/me?