# Base

A**base**is:

- A number that is raised to a power, or base of an exponential function. This finds common use, for example, in the depiction of numbers, for instance, 10 is the base used in the decimal system, whereas 2 is the base in the binary numeral system. See also numeral system, radix and table of bases.
- The base of a logarithmic function.
- One of the parallel sides of a trapezoid or the unequal side of an isosceles triangle.
- In topology, a base (topology) for a topology is a set of open sets such that every element of the topology is a union of the base sets. See also subbase.
- Base of a transform in mathematics
- In baseball, a base is one of 4 bags placed at corners of the infield diamond that a player has to run to after hitting the ball.
- In a transistor the
**base**is the controlling connection to the junction. - In Marxism describes the material equipment and material relations of human society, as distinct from the 'superstructural' forms of society - laws, customs, ideas, beliefs, etc.
- BASE jumping is an extreme variation on skydiving.
- The name of the terrorist group Al-Qaida translates as "the base."
- In 2001, the catchphrase "All your base are belong to us" swept across the Internet.
- In chemistry, a
**base**is the reactive complement to an acid. See Acid-base reaction theories. - In linguistics, a base is a synonym for root word.
- In telecommunications, Base is a mobile telephony company in Belgium, a subsidiairy of the Dutch telecommunications company KPN.
**Base**is also an isolated settlement in inhospitable conditions that must rely on outide help in order to survive, such as military base,**Antarctica base**, Moon base.- In architecture the lower, supporting part of a column. See base (architecture).

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