Webster’s Revised Unabridged Dictionary · 1913
Concinnity
Con·cin′ni·ty (·nĭ·ty̆), n. [L. concinnitas, fr. concinnus skillfully put together, beautiful. Of uncertain origin.] Internal harmony or fitness; mutual adaptation of parts; elegance; — used chiefly of style of discourse. [R.]
An exact concinnity and eveness of fancy. Howell.