aptness
- n  a disposition to behave in a certain way
                    
                        
                            
the aptness of iron to rust - n  appropriateness for the occasion
                    
                        
                            
the phrase had considerable aptness 
- Haruki Murakami doesn't much go in for metaphors, but even he wouldn't deny the aptness and symbolism of the moment when he decided he would write his first novel.
 - Angels' director, McG, is one of those pop-culture polymaths, up out of music videos, who can refer to anything, from Dirty Harry to A Star Is Born, with casual aptness.
 - Zeffirelli stuffed his cast with stars of varying aptness: Laurence Olivier rolling his eyes as Nicodemus, Rod Steiger spuming as Pilate, Ernest Borgnine in the John Wayne .