• WordNet 3.6
    • v perturb throw into great confusion or disorder "Fundamental Islamicists threaten to perturb the social order in Algeria and Egypt"
    • v perturb disturb in mind or make uneasy or cause to be worried or alarmed "She was rather perturbed by the news that her father was seriously ill"
    • v perturb cause a celestial body to deviate from a theoretically regular orbital motion, especially as a result of interposed or extraordinary gravitational pull "The orbits of these stars were perturbed by the passings of a comet"
    • v perturb disturb or interfere with the usual path of an electron or atom "The electrons were perturbed by the passing ion"
    • ***
Webster's Revised Unabridged Dictionary
    • Perturb To disorder; to confuse.
    • Perturb To disturb; to agitate; to vex; to trouble; to disquiet. "Ye that . . . perturb so my feast with crying."
    • ***
Century Dictionary and Cyclopedia
    • perturb To disturb greatly; agitate; disquiet.
    • perturb To disorder; confuse; cause irregularity in.
    • ***
Chambers's Twentieth Century Dictionary
    • v.t Perturb per-turb′ to disturb greatly: to agitate—also Per′turbate
    • ***


Webster's Revised Unabridged Dictionary
L. perturbare, perturbatum,; per + turbare, to disturb, fr. turba, a disorder: cf. OF. perturber,. See Per-, and Turbid
Chambers's Twentieth Century Dictionary
Fr.,—L. perturbāre, -ātumper, thoroughly, turbāre, to disturb—turba, a crowd.


In literature:

But there was absolutely no sign there of any perturbation.
"None Other Gods" by Robert Hugh Benson
He started, his perturbed imagination again touched.
"Visionaries" by James Huneker
Rarely have I seen her so thoroughly perturbed.
"The Wit and Humor of America, Volume I. (of X.)" by Various
Her perturbations refused to be stilled.
"Arthur Mervyn" by Charles Brockden Brown
The next morning I awaited with considerable perturbation of mind the arrival of my nun.
"The House of Martha" by Frank R. Stockton
And there was a perturbed look on his face.
"The Rebellion of Margaret" by Geraldine Mockler
Althea could not have faced the perturbing fact that charm, to her, counted for more than goodness.
"Franklin Kane" by Anne Douglas Sedgwick
Then I watched him going down among the trees and the shadows, and I sat, much perturbed in spirit, waiting for Barbara.
"Lippincott's Magazine of Popular Literature and Science, Volume 22. October, 1878." by Various
He came to a perturbed rest at the huge, half-hospitable Hospice, to the enthusiasm of the postilions.
"Bohemian Days" by Geo. Alfred Townsend
None had arrived, and Miss Allen, naturally, appeared in great perturbation before the sympathetic but helpless hotel manager.
"Phantom Wires" by Arthur Stringer

In poetry:

How I am pleased with thee, sweet girl! But do
Shake off this perturbation, be not anxious,
Be not alarmed, I want to hear thee talk -
Be cheerful.
"Nathan The Wise - Act V" by Gotthold Ephraim Lessing
All summer cannot quicken it with heat,
Nor Spring perturb it with a budding bough,
Nor all the glittering devils of the sleet
In snowing Winter rack its quiet now.
"The Golden Corpse" by Stephen Vincent Benet
CLARIN. What wonder?
When a thousand times have I
Scraped the earth as if for nuggets,
When a thousand times the wind
By my screeching was perturbed,
And yet Livia was oblivious.
"The Wonder-Working Magician - Act III" by Denis Florence MacCarthy
That glowing hair on shoulders white
Is pride past sum: take care, take care!
Even to dream of wish'd delight
Too much perturbs the ebb of night--
Bind up, bind up your burning hair!
"Take Care, Take Care" by John Freeman
When this was told to CAPTAIN TODD,
At first he thought it rather odd,
And felt some perturbation;
But very long he did not grieve,
He thought he could a way perceive
To SUCH a situation!
"The Sensation Captain" by William Schwenck Gilbert
"To-day my soul clasps Form; but where is my troth
Of yesternight with Tune: can one cleave to both?"
- "Be not perturbed," said she. "Though apart in fame,
As I and my sisters are one, those, too, are the same.
"Rome: The Vatican-Sala Delle Muse." by Thomas Hardy

In news:

Researchers Provide Systems-Level Dissection of Regulatory Perturbations in Cancer.
A worried-looking Demi Moore looks perturbed in between takes on the set.
At one heated point in Monday night's South Carolina Democratic debate, a perturbed Barack Obama finally blurted out to Hillary Clinton what millions of others have been thinking these past weeks.
And an internationally acknowledged expert on the applied- mathematics technique known as perturbation, died April 17 at Albany Medical Center Hospital.
Poet perturbed by MLK paraphrase.
You know the one — full-sized American steel with a low-profile tow rack in the bed, the claws of which protrude out of the tailgate like a perturbed crab looking to pinch pinch a car.
Perturbations to their structures caused by mysterious rocketing objects.
Those perturbations tip the researchers that a sunspot is forming.
Those perturbations are what tip the researchers that a sunspot is forming.
Our company recently implemented a policy that has quite a few people perturbed, myself included.
Mention nurses in the Bay Area these days and two images come to mind: a caring, nurturing professional at a patient's bedside, and a perturbed, bullhorn carrying protester walking a picket line.
I was both pleased and perturbed by the "On the Runway" story in the Sunday New York Times Style section on January 30th.
Preseason or not, there's nothing easier to predict than Rick Carlisle being perturbed after a poor defensive performance.
NBA Playoff primer, plus a pick that might perturb you.
Baseball Stadiums' Peanut -Free Seating Perturbs Some Fans.

In science:

The perturbative formulation of this partition function was first given by Bernard and Golterman [104], and a perturbative calculation of the dependence of the condensate on the spectral mass was first performed in Ref. [106].
Random Matrix Theory and Chiral Symmetry in QCD
The natural example leading to the quantization condition in this form is the perturbation of a Hamiltonian by rank-one perturbation.
Singular statistics
Nevertheless, the discussion of more general perturbations is modelled by the case of ∇–perturbation.
Relative Zeta Functions, Determinants, Torsion, Index Theorems and Invariants for Open Manifolds
Finally the last class of admitted perturbations are compact topological perturbations which will be the content of the next section.
Relative Zeta Functions, Determinants, Torsion, Index Theorems and Invariants for Open Manifolds
We define the notions of perturbative/non-perturbative regimes and in particular we explain the adiabatic/sudden limits.
Quantum Irreversibility of Energy Spreading