Base

In mathematics, base refers to:

• 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 system. See also Numeral system.
• The base of a logarithmic function.
• One of the parallel sides of a trapezoid or the unequal side of an isosceles triangle.
• Another mathematical meaning is described in the topology glossary.
• Base of a transform

See also:

• Table of bases -- A table of the values of 1-100 in bases 2-20.

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In chemistry, a base is the reactive complement to an acid. (Sometimes the term alkali has been used historically where base is now preferred.) See Acid-base reaction theories. Technically, a substance capable of neutralizing acid, with a pH greater than 7.0.

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In biochemistry, see nitrogenous base.

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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.

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In a transistor the base is the controlling connection to the junction[?].

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The name of the terrorist group Al-Qaida translates as "the base."

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In 2001, the catchphrase "All your base are belong to us" swept across the Internet. It came from a poorly translated video game called Zero Wing.

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BASE jumping is a popular variation on skydiving.