base
• noun the main ingredient of something such as a paint or an ointment
• noun a number that is taken as the basis of a system of calculation, representing the number of units in the system
• noun a class from which other classes can be derived by inheritance
• The foundation of something, or the material that composes said foundation. For instance, silicon serving as a base material in semiconductor manufacturing, or acetate film used as a base for magnetic recording tape.
• In a bipolar junction transistor, the region between the emitter and the collector, into which the emitter injects minority carriers. Also, the electrode attached to this region. Its symbol is B. Also called base region, base electrode, or base element.
• A starting point or basis, such as a base address.
• A reference parameter, such as time based on atomic frequencies.
• A chemical which does any of the following: that increases the proportion of hydroxyl ions in a solution, that accepts a proton in solution, that can react with an acid to form a salt, or that donates two electrons. According to the pH scale, a base has a reading of greater than 7.0, while an acid has a value below 7.0. The higher the reading, the stronger the base.
• In an electron tube, the insulated portion through which its connecting terminals protrude.
• The number of digits used in a numbering system. For example, 2 in the binary system or 10 in the decimal system. The base also serves as the multiplier within its numbering system. In the decimal system, for instance, each single position movement to the right of a digit represents a division by 10, while a movement to the left is a multiplication by 10. This can be seen, for example, in the number 153, where the 1 is in the hundreds position, the 5 is the tens, and the 3 is the units. Also called base number, radix, or radix number.
• A number which is raised by a power indicated by another number, called the exponent. For example, in 28, the 2 is the base, and the 8 is the exponent.
• The number upon which a logarithm system is based. That is, the number which is raised to a power indicated by an exponent. For example, log10 1000 = 3, as 10, the base in this example, must be raised to the power of three to equal 1000. Logarithms may use any number as their base. common logarithms have a base of 10, and natural logarithms have a base equal to approximately 2.71828.
• symbol B

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