concinnity kuhn-SIN-uh-tee, noun:
1. Internal harmony or fitness in the adaptation of parts to a whole or to each other.
2. Studied elegance of design or arrangement — used chiefly of literary style.
3. An instance of concinnity.

Concinnity comes from Latin concinnitas, “elegance; harmony of style,” from concinnus, “well put together; pleasing, on account of harmony and proportion.”