A carpentry obstruction, stockade, or other obstacle made in a passage in order to stop an enemy.

Any obstruction; anything which hinders approach or attack.

In employment, the term refers to the hidden, invisible and/or visible obstacles to equity in work or promotional opportunities. In anti-racism, the concept is extended to include obstacles to racism-free environments, services and other service delivery issues.

A physical barrier to pedestrian movements, installed where there is a serious risk to their safety.

A synchronization mechanism applied to groups of processes, with the property that no process in the group may pass the barrier until all processes in the group have reached the barrier. In other words, processes arriving at the barrier suspend or block until all processes have arrived; they may then all proceed.

Any material or system that blocks or reduces the transmitted sound level as it passes through the material. A poor barrier material will provide a transmission loss TL 10 dB, whereas a good material will have a TL 20 dB for partial height barriers and TL 50 dB for full height barriers, at the frequencies of interest. Both STC and CAC are measures of acoustical barrier performance.

(n.) A point in a program at which barrier synchronization occurs. See also fuzzy barrier.

a global synchronization operation, implemented as a

Any limit or boundary; a line of separation.

A partition of electrically nonconductive material which increases the electrical path between adjacent electrical circuits or an electrical circuit from ground.

A physical partition that affords aseptic processing area (ISO 5) protection by partially separating it from the surrounding area.

a defensive form of boundary, one that expresses one ' s will to keep separate

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.

Depicted occasionally in manuscript references, most of the 14th century examples seem to have taken place during a siege. The gateway to a castle is opened, after a wooden barricade, resembling a conventional wooden fence, has been set up around the opening. This serves to keep the castle from being overrun during the "à plaisance" engagement. In the surviving illustration, knights compete with spears only, on foot. Some of them are wounded, but there are no serious injuries. During the 15th century combats over the barriers became a part of the pas d'armes, gaining in popularity as the century progressed. They remained in fashion even during the 16th century, when elaborate garnitures were constructed.

A fence, wall or railing to prevent passage or approach.

An element that prevents or impedes the dispersal of a species from one location to another. For example, roads act as barriers to some small species, such as amphibians and reptiles, and dams often act as barriers to migrating fish.

Any impediment to the international movement of goods, services, capital, or other factors of production. Most commonly a trade barrier. An entry barrier.

an environment that prevents or impedes the dispersal of a species from one location to another. A fast moving river may serve as a barrier for species that cannot fly or swim.

a structure or object that impedes free movement

anything that can prevent a patient from being able to adhere to a TB treatment regimen

Something preventing timely success of achieving an objective.

A natural feature, human-built structure or technology that prevents passage.

is a thin layer of conducting film which prevents the primary conductor, either aluminum or copper, from migrating into the oxide or silicon. A secondary purpose of the barrier is to promote adhesion of the primary conductor.

The metal gates where the horses are assembled to start the race.

The divider between two jousting lanes. It is intended to keep the horses from colliding.

Something that stops or blocks things from going past it. A wall or a gate is a BARRIER. Condoms act as a barrier of protection between one person's body fluids and another person's body skin. Sheets of latex or plastic wrap can also be used as BARRIERS for ORAL SEX.

Another term for the mobile barrier. A barrier may also refer to the position a horse has drawn in a mobile event.

A material that when placed around a source of noise inhibits the transmission of that noise beyond the barrier. Also, an environment or any physical thing that interferes with communication or listening.

Anything physical or an environment that interferes with communication or listening. A poor acoustical environment can be a barrier to good listening and especially so for persons with a hearing impairment.

Physical entity that limits current and voltage into a hazardous area in order to satisfy Intrinsic Safety requirements.

In protective clothing, barrier is the ability to isolate the body from a chemical, physical, biological, radioactive or thermal hazard, among others.

Something that slows or stops movement from one place to another.

A restriction of joint or tissue movement.

Any object used to stop the movement of vehicles. See Anti-Ram Vehicle Barrier.

Protection from deterioration or admittance of moisture or other elements (such as oxygen and other gases) through package material.

a buildup of beach materials lying offshore, above sea level most or all of the time

Protection from deterioration or ingress of moisture through package material.

The positions in the starting stall that the runners start the race from.

A starting device used in steeplechasing consisting of an elastic band stretched across the racetrack which springs back when released. Also known as a "tape."

(Also Tape) A starting device used in steeple chasing consisting of an elastic band stretched across the racetrack which retracts when released.