from The American Heritage® Dictionary of the English Language, 5th Edition.

  • transitive verb To disturb or confuse; make uneasy or anxious.
  • transitive verb To cause (a system) to become altered or imbalanced from a normal state.
  • transitive verb Physics & Astronomy To cause perturbation in (the orbit of a celestial body, for example) by gravitational interaction.

from The Century Dictionary.

  • To disturb greatly; agitate; disquiet.
  • To disorder; confuse; cause irregularity in.

from the GNU version of the Collaborative International Dictionary of English.

  • transitive verb To disturb; to agitate; to vex; to trouble; to disquiet.
  • transitive verb rare To disorder; to confuse.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • verb To disturb; to bother or unsettle.
  • verb physics To slightly modify the motion of an object.
  • verb astronomy To modify the motion of a body by exerting a gravitational force.
  • verb mathematics To modify slightly, such as an equation or value.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • verb disturb in mind or make uneasy or cause to be worried or alarmed
  • verb throw into great confusion or disorder
  • verb disturb or interfere with the usual path of an electron or atom
  • verb cause a celestial body to deviate from a theoretically regular orbital motion, especially as a result of interposed or extraordinary gravitational pull


from The American Heritage® Dictionary of the English Language, 4th Edition

[Middle English perturben, from Old French perturber, from Latin perturbāre : per-, per- + turbāre, to throw into disorder (from turba, confusion, perhaps from Greek turbē).]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Middle English perturben, from Old French perturber, from Latin perturbare ("throw into confusion, confuse, disorder, disturb"), from per ("through") + turbare ("to confuse, disturb").


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  • Specifically, related to anxiety.

    July 24, 2015