a structure or object that impedes free movement
any condition that makes it difficult to make progress or to achieve an objective
"intolerance is a barrier to understanding"
anything serving to maintain separation by obstructing vision or access
A structure that bars passage.
An obstacle or impediment.
A boundary or limit.
a carpentry obstruction, stockade, or other obstacle made in a passage in order to stop an enemy
a fortress or fortified town, on the frontier of a country, commanding an avenue of approach
a fence or railing to mark the limits of a place, or to keep back a crowd
an any obstruction; anything which hinders approach or attack
any limit or boundary; a line of separation
In parallel computing, a barrier is a type of synchronization method. A barrier for a group of threads or processes in the source code means any thread/process must stop at this point and cannot proceed until all other threads/processes reach this barrier. Many collective routines and directive-based parallel languages impose implicit barriers. For example, a parallel do loop in Fortran with OpenMP will not be allowed to continue on any thread until the last iteration is completed. This is in case the program relies on the result of the loop immediately after its completion. In message passing, any global communication may imply a barrier. Classic barrier constructs define the set of participating processes/threads statically. This is usually done either at program startup or when a barrier like the Pthreads barrier is instantiated. This restricts the possible applications for which barriers can be used. To support more dynamic programming paradigms like fork/join parallelism, the sets of participants have to be dynamic. Thus, the set of processes/threads participating in a barrier operation needs to be able to change over time. X10 introduced the concept of clocks for that purpose, which provide a dynamic barrier semantic. Building on clocks, phasers have been proposed to add even more flexibility to barrier synchronization. With phasers it is possible to express data dependencies between the participating processes explicitly to avoid unnecessary over-synchronization.
Chambers 20th Century Dictionary
bar′i-ėr, n. a defence against attack: a limit or boundary: a fence, railing, gate where customs are collected: the lists in a tournament: any obstacle that keeps apart: (pl.) a martial exercise in 15th and 16th centuries.—v.t. to shut by means of a barrier.—n. Bar′rier-reef, a coral-reef surrounding an island or fringing a coast with a navigable channel inside.—Barrier Act, an act passed by the General Assembly of the Church of Scotland in 1697 as a security against innovations, decreeing that changes in the law of the Church, even when approved by the Assembly, shall not become law till approved also by a majority of presbyteries. [O. Fr. barrière—Low L. barraria—barra, bar.]
Dictionary of Military and Associated Terms
A coordinated series of obstacles designed or employed to channel, direct, restrict, delay, or stop the movement of an opposing force and to impose additional losses in personnel, time, and equipment on the opposing force. Barriers can exist naturally, be man-made, or a combination of both.
Military Dictionary and Gazetteer
In a general sense means any fortification or strong place on the frontiers of a country. It is likewise a kind of fence composed of stakes and transoms, as over-thwart rafters, erected to defend the entrance of a passage, retrenchment, or the like. In the middle of the barrier is a movable bar of wood, which is opened or shut at pleasure. It also implies a gate made of wooden bars, about 5 feet long, perpendicular to the horizon, and kept together by two long bars going across and another crossing diagonally. Barriers are used to stop the cut made through the esplanade before the gate of a town.
British National Corpus
Rank popularity for the word 'barrier' in Nouns Frequency: #1373
The numerical value of barrier in Chaldean Numerology is: 6
The numerical value of barrier in Pythagorean Numerology is: 8
Examples of barrier in a Sentence
When it closed down, there was a local petition against it and hundreds of people from every part of the community signed it. Whoever takes it over is going to have to overcome that barrier. That's not to say it can't be done.
I think a cut plus 100 billion pounds in new quantitative easing is probably the barrier (to more falls).
By insisting that the Australian government prepare a report within 18 months ... UNESCO has clearly shown that the Great Barrier Reef is not fine and is not safe in Tony Abbott's hands.
I have no doubt that they (UNESCO delegates) had a perception that the barrier reef was dead. That it was doomed, it was down, it was in a bad place. And that's not the case at all, it's my belief, and it's the belief of many people, that the barrier reef has turned the corner and it's slowly improving.
Unfortunately the recruitment practices of too many businesses still remain trapped in permafrost and that's holding back women and ultimately the companies themselves, the recruitment process to the boards of Britain's top companies remains shadowy and opaque and is acting as a barrier to unleashing female talent.
Popularity rank by frequency of use
Translations for barrier
From our Multilingual Translation Dictionary
- hindernis, versperringAfrikaans
- преграда, препятствие, бариера, границаBulgarian
- barrier, hindringDanish
- Schranke, Barriere, Schlagbaum, Hindernis, GrenzeGerman
- barrera, límiteSpanish
- este, aita, rajaFinnish
- barrière, frontière, limiteFrench
- bacadhScottish Gaelic
- akadály, sorompóHungarian
- barriera, limiteItalian
- obstáculo, barreira, limitePortuguese
- лимит, барьер, препятствие, граница, преграда, предел, шлагбаумRussian
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