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per·tur·ba·tion (pûr'tər-bā'shən)
n.
    1. The act of perturbing.
    2. The state of being perturbed; agitation.
    1. A small change in a physical system.
    2. Physics & Astronomy. Variation in a designated orbit, as of a planet, resulting from the influence of one or more external bodies.
perturbational per'tur·ba'tion·al adj.

logo 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.

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