fine-tune definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
fine-tune definition by American Heritage Dictionary
transitive verb fine-tuned fine-tuned, fine-tun·ing, fine-tunes
To make small adjustments in for optimal performance or effectiveness: “Advertising agencies kept fine-tuning the coolly calculated machinery of merchandising and hype” (New Yorker).