con·cin·ni·ty 
(k
ən-s
ĭn
ĭ-t
ē)
n. pl. con·cin·ni·ties 1. Harmony in the arrangement or interarrangement of parts with respect to a whole.
2. Studied elegance and facility in style of expression: "He has what one character calls 'the gifts of concinnity and concision,' that deft swipe with a phrase that can be so devastating in children" (Elizabeth Ward).
3. An instance of harmonious arrangement or studied elegance and facility.
[From Latin concinnitās, from concinnāre, to put in order, from concinnus, deftly joined.]