In the past, many borders were not clearly defined lines, but were neutral zones called marchlands. This has been reflected in recent times with the neutral zones that were set up along part of Saudi Arabia's borders with Kuwait and Iraq (however, these zones no longer exist). In modern times, the concept of a marchland has been replaced by that of the clearly defined and demarcated border. For the purposes of border control, airports and seaports are also classed as borders. Most countries have some form of border control to restrict or limit the movement of people, animals, plants, and goods into or out of the country. Under international law, each country is generally permitted to define the conditions that have to be met by a person to legally cross its borders by its own laws, and to prevent persons from crossing its border when this happens in violation of those laws.
Some borders require presentation of legal paperwork like passports and visas, or other identity documents to cross borders. To stay or work within a country's borders aliens (foreign persons) may need special immigration documents or permits that authorise them to do so. Having such documents (i.e., visa and passport) however does not automatically guarantee that the alien will be allowed to cross to the other side of the border.
Moving goods across a border often requires the payment of excise tax, often collected by customs officials. Animals (and occasionally humans) moving across borders may need to go into quarantine to prevent the spread of exotic or infectious diseases. Most countries prohibit carrying illegal drugs or endangered animals across their borders. Moving goods, animals or people illegally across a border, without declaring them, seeking permission, or deliberately evading official inspection constitutes smuggling.
In regions where smuggling, migration, and infiltration are a problem, many countries fortify borders with separation barriers and institute formal border control procedures. Some borders are only signposted. This is common in countries within the European Schengen Area and on rural sections of the Canada – United States border. Borders may even be completely unmarked, a common occurrence with remote or forested borders.
Hostile countries that are not at war may be separated by a militarized border. The most well-known of these is the former Berlin Wall. Furthermore, many hostile, militarized borders are separated by a buffer zone or demilitarized zone, such as the Korean Demilitarized Zone and the United Nations Buffer Zone in Cyprus, and may be separated by a buffer state. The most extreme borders are completely closed with no passage, such as the Blue Line that separates Israel and Lebanon.
Read more about this topic: Border
Other articles related to "definitions, definition":
... Some definitions of language, such as early versions of Charles Hockett's "design features" definition, emphasize the spoken nature of language ... Mathematics would not qualify as a language under these definitions, as it is primarily a written form of communication (to see why, try reading Maxwell's equations out loud) ... However, these definitions would also disqualify sign languages, which are now recognized as languages in their own right, independent of spoken language ...
... Although topographic maps of the Chile and Argentina border region which contains the highest peaks are of notoriously poor accuracy, with elevation errors exceeding 100 metres (330 ft) in many cases, the current consensus based on the most recent measurements places Ojos del Salado as the 2nd highest peak and highest volcano in South America, significantly higher than Monte Pissis. ...
... A theoretical (or conceptual) definition gives the meaning of a word in terms of the theories of a specific discipline ... This type of definition assumes both knowledge and acceptance of the theories that it depends on ... An example of a theoretical definition is that of "Heat" in physics, which actually puts forth an entire theory of heat (involving accelerating molecules, etc.) ...
... precise terminology that cannot be confused with other words or definitions ... He gave emphasis on avoidance of words that have many definitions and compared the language of Scientology with the language of Math and other precise doctrines ... Scientology and Dianetics place a heavy emphasis on understanding word definitions ...
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