Noun : She has a special aptitude for mathematics. ,He was placed in honors classes because of his general aptitude.    From Dictionary.com. 

It has a wider aptitudinal range than any other cereal in Ethiopia.    From Wordnik.com.  [12. Tef] Reference

While aptitudinal extension or internal quantity is so bound up with the essences of bodies that its separability from them involves a metaphysical contradiction, external quantity is, on the other hand, only a natural consequence and effect, which can be so suspended and withheld by the First Cause, that the corporeal substance, retaining its internal quantity, does not extend itself into space.    From Wordnik.com.  [The Catholic Encyclopedia, Volume 5: Diocese-Fathers of Mercy] Reference