To A Nicety Meaning

(idiomatic) To a fine point, with great exactness or accuracy.

Example: 1960, P. G. Wodehouse, Jeeves in the Offing, chapter XVII:
  She gulped like a bulldog trying to swallow a sirloin steak many sizes too large for its thoracic cavity. “You mean there are two of them?” “Exactly.” “And Wilbert isn't the one I thought he was?” “You have grasped the position of affairs to a nicety.”