Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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).