1. Not penetrating the body, as by incision or injection: noninvasive surgery; a noninvasive diagnostic method.
2. Not invading healthy tissue: noninvasive cancer of the bladder.

The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.