what your good looks can do for you. or what your friend's good looks can do for you. the usefulness of being hot.
last night, we got free drinks and I got laid cuz you were dressed like a slut. man, your beautility was in full effect.
An object that is both beautiful and useful, generally objects of industrial design which are meant to have utility while having a pleasing aesthetic.
The beautility of architecture is seen in Frank Lloyd Wright's "Waterfall Home", but there is also beautility in small things like intricately patterned silverware.