What is the Meaning & Definition of parallel

According to the context in which it is used, the parallel Word will present different references...
At the behest of the geometry, parallel, it will be that line or plane equidistant from another line or plane, so that even though they may be long will not cut. On the contrary, lines or perpendicular planes are that Yes can be found at a point to be extended. Two lines are parallel if they have equal slopes.
On the other hand, to that corresponding, similar or that develops at the same time also is called parallel. The Association is carrying out parallel policies in the area of the earthquake, are rebuilding houses on the one hand and receiving the help that comes from other countries, on the other.
In cartography, a parallel will be each of the imaginary horizontal circles that surround the Earth. About Parallels and starting from the Meridian to be taken as origin, for example the meridian of Greenwich, the length, which may be East or West, depending on the sense of the same measure can be measured.
Contrary to what happens with the meridians, parallels are not maximum circumferences, because except for the Ecuador does not contain to the center of the Earth; the angle forming a Meridian and the equator is called latitude, which can be North or South, according to the hemisphere.
There are five extraordinary Parallels, they are: Arctic Circle (66.5 ° N latitude), tropic of Cancer (latitude of 23.5 ° N; it's parallel to the North found and in which the sun reaches the Zenith, that occurs during the June Solstice), Ecuador (latitude 0 °; here the Sun culminates the zenith in the spring and autumn equinox) Tropic of Capricorn (23.5 ° s; more is parallel to the South that exists, reaching the zenith during the December Solstice) and Antarctic Circle (of 66.5 ° latitude South).
Is why these parallels that planet Earth is divided into four zones: inter-tropical zone, temperate zone and zone glacier or polar area.
On the other hand, in mechanics, a parallel will be the operation that takes place in front of a vehicle wheels so that they rotate and roll in parallel mode.
And at the behest of the sport is called parallel to the parallel bars in which there are various gymnastic exercises.