obstruction

Definitions

  • One can generally pass around obstructions like this on the trail
    One can generally pass around obstructions like this on the trail
  • WordNet 3.6
    • n obstruction getting in someone's way
    • n obstruction the act of obstructing "obstruction of justice"
    • n obstruction any structure that makes progress difficult
    • n obstruction something immaterial that stands in the way and must be circumvented or surmounted "lack of imagination is an obstacle to one's advancement","the poverty of a district is an obstacle to good education","the filibuster was a major obstruction to the success of their plan"
    • n obstruction the physical condition of blocking or filling a passage with an obstruction
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Webster's Revised Unabridged Dictionary
    • Obstruction That which obstructs or impedes; an obstacle; an impediment; a hindrance. "A popular assembly free from obstruction ."
    • Obstruction The act of obstructing, or state of being obstructed.
    • Obstruction The condition of having the natural powers obstructed in their usual course; the arrest of the vital functions; death. "To die, and go we know not where,
      To lie in cold obstruction , and to rot."
      "Disparity in age seems a greater obstacle to an intimate friendship than inequality of fortune.""The king expected to meet with all the obstructions and difficulties his enraged enemies could lay in his way."
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Century Dictionary and Cyclopedia
    • n obstruction The act of obstructing, blocking up, or impeding passage, or the fact of being obstructed; the act of impeding passage or movement; a stopping or retarding: as, the obstruction of a road or thoroughfare by felled trees; the obstruction of one's progress or movements.
    • n obstruction That with which a passage is blocked or progress or action of any kind hindered or impeded; anything that stops, closes, or bars the way; obstacle; impediment; hindrance: as, obstructions to navigation; an obstruction to progress.
    • n obstruction Stoppage of the vital function; death.
    • n obstruction Systematic and persistent factious opposition, especially in a legislative body; factious attempts to hinder, delay, defeat, or annoy.
    • n obstruction Synonyms Difficulty, Impediment, etc. (see obstacle), bar, barrier.
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Chambers's Twentieth Century Dictionary
    • Obstruction act of obstructing: that which hinders progress or action: opposition, esp. in a legislative assembly
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Quotations

  • Hsi-Tang
    Hsi-Tang
    “Although gold dust is precious, when it gets in your eyes it obstructs your vision.”

Etymology

Webster's Revised Unabridged Dictionary
L. obstructio,
Chambers's Twentieth Century Dictionary
L. obstruĕre, obstructumob, in the way of, struĕre, structum, to pile up.

Usage

In literature:

This term applies to obstruction of the gullet as well as that of the windpipe.
"The Veterinarian" by Chas. J. Korinek
The great organs, being obstructed in their spontaneous-automatism, at last with violence arouse the active conscious-centers.
"Fantasia of the Unconscious" by D. H. Lawrence
Camillo surveyed the obstruction and decided to wait.
"Brazilian Tales" by Joaquim Maria Machado de Assis
But, no doubt, obstructions would present themselves along the route to cause many a detour.
"The Castaways" by Captain Mayne Reid
The obstruction was only apparent, and did not cause the leading savage of the party to make even a temporary stop.
"The Lone Ranche" by Captain Mayne Reid
Such was the general character of the obstructions before the fleet.
"The Gulf and Inland Waters" by A. T. Mahan
There are no obstructions in the way, are there?
"Canoe Boys and Campfires" by William Murray Graydon
It seems to mean obstructed circulation through the lungs.
"Preventable Diseases" by Woods Hutchinson
In spite of the sunken obstructions, the ships made their way through without difficulty.
"The Campaign of 1776 around New York and Brooklyn" by Henry P. Johnston
There was a collision, the track was obstructed, and only the 7th and 8th Georgia got through.
"The Long Roll" by Mary Johnston
It obstructs the approaches to the 'scupper' in front of my cabin door.
"Oswald Langdon" by Carson Jay Lee
It seemed impossible to avoid it, and equally impossible to back out along a road already obstructed.
"The English at the North Pole" by Jules Verne
The obstruction to rapid dispersion prevented the hope of liberty from acting on the imagination with proper efficacy.
"The History of Tasmania , Volume II (of 2)" by John West
Every form of irritating parochial obstruction was employed.
"To My Younger Brethren" by Handley C. G. Moule
Through Icy Sound we found some difficulty in penetrating, as the channel was much obstructed by ice.
"Narrative of the surveying voyages of His Majesty's ships Adventure and Beagle, between the years 1826 and 1836" by Robert FitzRoy
Freight hands were clearing it away, and it was this temporary obstruction that had been the cause of the warning torpedo.
"Ralph, the Train Dispatcher" by Allen Chapman
This is a most singular obstruction.
"The Columbia River" by William Denison Lyman
Eastward the view is obstructed by the hill of Screen, but on every other side it is superb.
"Beauties and Antiquities of Ireland" by T. O. Russell
Crowder then said, 'Police, take him up for obstructing the thoroughfare.
"The Great Acceptance" by Cyril Arthur Edward Ranger Gull
It is never hard to change the stolid opposition of the Indian peasant into stolid obstruction.
"Miss Stuart's Legacy" by Flora Annie Steel
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In poetry:

Shall human wisdom then, with beetle sight,
Because obstructed in its blund'ring flight,
Despise the deep conviction of our birth,
And limit life to this degraded earth?
"Eccentricity" by Washington Allston
The fearless Lover wants no Beam of Light,
The Robber knows him, nor obstructs his Way,
Sacred he wanders through the pathless Night,
Belongs to Venus, and can never stray.
"Elegy V" by James Hammond
I took it for a bird of prey that soared
High over ocean, battled mount, and plain;
'Twas but a bird-moth, which with limp horns gored
The invisibly obstructing window-pane!
"A Better Thing" by George MacDonald
Just so our course we steer,
In youth's expanding year,
Culling fresh sweets from ev'ry flower that blows;
Nor briars obstruct our way,
For ever brisk and gay,
Heedless of ev'ry thorn we pluck the rose.
"To The Bee" by Elizabeth Bath
Know'st thou the mountain, and its cloudy bridge?
The mule can scarcely find the misty ridge;
In caverns dwells the dragon's olden brood,
The frowning crag obstructs the raging flood.
Know'st thou it well?
"Mignon" by Johann Wolfgang von Goethe
"I'll see you damned," says Dooleyvitch; but e'er he checked his tongue,
(It may have been an accident) the little Giant swung;
Swift as a lightning flash it swung, until it plumply bore
And met with an obstruction in the shape of Lew lamore.
"The Ballad Of Touch-The-Button Nell" by Robert W Service

In news:

Filibusters have become a means of obstructing progress.
Star-Ledger file photo James Exum stands next to Salaam Ismial, Director of the United Youth Council Inc Ismial holds up the air freshener which police said was obstructing Exum's view when they pulled up next to his parked car on April 29.
Clinically, small bowel obstruction was suspected.
Obama deserves credit for progressing slowly despite the obstructions put in front of him.
The Arcapta Neohaler (indacaterol inhalation powder) has been approved by the US Food and Drug Administration for the long-term treatment of chronic obstructive pulmonary disease (COPD).
Reflexive Bipartisanship Is Just as Problematic as Obstruction.
WEST CALDWELL — A West Caldwell police report concluded that shrubbery around an intersection obstructed the view of a police officer responding to an emergency and caused a three-car crash last month when he ran through a red light.
At the time, they feared the dunes would obstruct the view of the beach.
He also faces charges for having an open container in a motor vehicle, underage drinking, damaging property and obstructing an officer.
It's used primarily, as the name suggests, as a photo and video platform because it has an open cockpit and there's nothing surrounding the front view to obstruct it.
The US Court of Appeals for the 10th Circuit has upheld the felony obstruction of justice conviction against former Albuquerque police officer Brad Ahrensfield.
Sleep apnea is a condition in which breathing during sleep is hindered by an obstruction in the airway.
Holy obstruction of justice Batman, caped crusader arrested in Michigan.
Caped crusader arrested for obstructing justice.
Former all-star baseball pitcher Roger Clemens leaves the US District Court on Monday after the first day of his perjury and obstruction trial in Washington, D.C.
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In science:

The class of its classifying cocycle is the obstruction of [ω ] to be integral.
Gerbes, 2-gerbes and symplectic fibrations
In the general case, we will use the gerbe C ′ (ω ) to define a 2-gerbe which represents the geometric obstruction of the class [ω ] to be lifted to P .
Gerbes, 2-gerbes and symplectic fibrations
The cohomology class of the classifying cocycle of this gerbe is the obstruction to extend [ω ].
Gerbes, 2-gerbes and symplectic fibrations
In Brylinski has studied the following problem: Suppose defined on P a 2-form Ω whose restriction to each fiber is closed, integral and symplectic, find obstructions to build a closed 2-form whose restriction to a fiber Fu above u, coincides with the restriction of Ω on the fiber Fu .
Gerbes, 2-gerbes and symplectic fibrations
If H 1 (F, IR) = 0, the obstruction to find such a class is a gerbe Cp (ω ) defined on N .
Gerbes, 2-gerbes and symplectic fibrations
F (ω ) is the obstruction for the existence of a Hamiltonian reduction of p : P → N .
Gerbes, 2-gerbes and symplectic fibrations
Then there exists a gerbe CH defined on N , bounded by the local ly constant sheaf defined on N by π which represents the obstruction of the bund le p : P → N to have a H -reduction.
Gerbes, 2-gerbes and symplectic fibrations
In the case of the lemma 2.6.5, above, the cohomology class of the classifying cocycle cH is the obstruction for the bundle ¯p to be flat.
Gerbes, 2-gerbes and symplectic fibrations
Let p : P → N be a symplectic bund le whose typical fiber is (F, ω ), then there exists a gerbe CH ams such that the cohomology class [cH ams ] ∈ H 2 (N , H 1 (F, IR)/H 1(F, Pω )) of its classifying cocycle cH ams is the obstruction to reduce the structural group of the bund le to H ams .
Gerbes, 2-gerbes and symplectic fibrations
If the coordinate changes of the bund le take their values in the connected component S ymp(F, ω )0 of S ymp(F, ω ), then there exists a gerbe CH am whose classifying cocycle is the obstruction for reduce the structural group to H am(F, ω ).
Gerbes, 2-gerbes and symplectic fibrations
Let H be a subgroup of G, if the left quotient H/G is a K (π , 1) space, it is possible to write a similar theorem to the one above, and obtain an obstruction cocycle whose cohomology class decide of the existence of a H -reduction.
Gerbes, 2-gerbes and symplectic fibrations
The Chern class UF of this bundle is the universal class UM defined by McDuff, it can be viewed as the cohomology class of the classifying cocycle of the gerbe which represents geometrically the obstruction for the previous H 1 (F, IR)/H 1(F, Pω )-bundle to be trivial.
Gerbes, 2-gerbes and symplectic fibrations
Since each (F, ω )-symplectic bundle p : P → N , is classified by a classifying map f : N → BS ymp(F, ω ), the obstruction class to obtain a H ams -reduction is f ∗ (UF ).
Gerbes, 2-gerbes and symplectic fibrations
Let (F, ω ) be a symplectic manifold, and CF (ω ) the T 1 -gerbe representing the obstruction of [ω ] to be integral.
Gerbes, 2-gerbes and symplectic fibrations
We will now describe the 2-gerbe and 2-gerbed towers bounded by the sheaf of locally constant IR-functions which represent the geometric obstruction to extend ω to P when the cohomology class [ω ] of ω is not necessarily integral.
Gerbes, 2-gerbes and symplectic fibrations
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