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a. The act of perturbing.
b. The state of being perturbed; agitation.
2. A small change in a physical system, such as a variation in a planet's orbit resulting from the gravitational influence of other celestial bodies.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
relating to perturbation
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014