Definition of "tunable" [tun•a•ble]

• That can be tuned: a tunable wind instrument; a tunable radio. (adjective)
• Archaic Tuneful. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "But bending light so that it passes round a region of space and emerges travelling along the same line as it was initially is a difficult trick, requiring an invisibility cloak made from materials with a 'tunable' refractive index."
• "Also, some claim that LASIK is actually a bit more "tunable"."
• "Fontecchio aims to make a device that is both lightweight and instantly "tunable" for different light signatures"