Is cross-sectional area over length classified separately from length? The ratio of cross-sectional area to length (or its reciprocal) appears in several formulas, including those for electrical resistance and capacitance in terms of the resistivity and permittivity. However, I've never heard a term or a separate name for this.
The Wikipedia article on length claims:

In the International System of Quantities, length is any quantity with dimension distance.

The ratio described has dimension distance; yet, intuitively, it is very different from length. Is it considered differently from length, and if so, is there a term for it?
 A: The equation for capacitance is $C=\kappa \epsilon_0 A / d$ and the equation for electrical resistance is $R=\rho L / A$.  While it is true that an isolated fraction of $A/d$ dimensionally reduces to a length and an isolated fraction of $L/A$ dimensionally reduces to the reciprocal of length, that is not the point of the listed equations.  Any physics equation normally contains the minimum number of independent variables that describes the different things that interact to produce the physical interaction and result that is being observed.  
For electrical resistance, a wire's resistance will directly increase with increasing length, and its resistance will directly decrease with increasing cross-sectional area.  These two variables need not be changed separately, as you can easily specify a wire that is twice as long, with twice the cross-sectional area, if you want to leave the resistance unaffected.  Such a decision may be necessary in the real world if you find that an original estimated length is short by a factor of 1.5 and wires are only sold in standard lengths.  Naturally, if the resistance equation was dimensionally reduced to $R=\rho/L$, the respecification problem would be totally obscured, and everyone would conclude that a doubling of length automatically resulted in a halving of resistance, which is clearly incorrect.  The same type of argument can be given for the capacitance equation.
Thus, physics equations are written in a way that allows people to $read$ the equation such that they can determine the relationship between ALL of the important variables involved in the relevant situation.  Any dimensional over-simplification of such equations destroys the ability to properly read such an equation, and necessarily destroys most of the important information that such an equation was meant to convey.
