from The American Heritage® Dictionary of the English Language, 4th Edition
- transitive v. To disturb greatly; make uneasy or anxious.
- transitive v. To throw into great confusion.
- transitive v. Physics & Astronomy To cause perturbation, as of a celestial orbit.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. To disturb; to bother or unsettle.
- v. To slightly modify the motion of an object.
- v. To modify the motion of a body by exerting a gravitational force.
- v. To modify slightly, such as an equation or value.
from the GNU version of the Collaborative International Dictionary of English
- transitive v. To disturb; to agitate; to vex; to trouble; to disquiet.
- transitive v. To disorder; to confuse.
from The Century Dictionary and Cyclopedia
- To disturb greatly; agitate; disquiet.
- To disorder; confuse; cause irregularity in.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- v. disturb in mind or make uneasy or cause to be worried or alarmed
- v. throw into great confusion or disorder
- v. disturb or interfere with the usual path of an electron or atom
- v. cause a celestial body to deviate from a theoretically regular orbital motion, especially as a result of interposed or extraordinary gravitational pull
Middle English perturben, from Old French perturber, from Latin perturbāre : per-, per- + turbāre, to throw into disorder (from turba, confusion, perhaps from Greek turbē).(American Heritage® Dictionary of the English Language, Fourth Edition)
From Middle English perturben, from Old French perturber, from Latin perturbare ("throw into confusion, confuse, disorder, disturb"), from per ("through") + turbare ("to confuse, disturb"). (Wiktionary)