A base, mathematically speaking, defines the digits which you use to count. Normally, we tend to use base ten - meaning that we have ten values (0-9); if we used base two instead (binary - this is what computers use) then only have two (0 or 1).
An example of how numbers compare in different bases:
Decimal (base 10): 147
Binary (base 2): 10010011
Octal (base 8): 223
Hexatridecimal (base 36): 43
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It could mean the base of a number system, such as decimal is base-10, or binary is base-2, or hexidecimal is base-16. Or it can refer to when a number has an exponent, like 23, 2 is the base, and 3 is the exponent. Or ex, where e represents the base of the natural logarithm. Here is another word 'base'. This is related to the base/exponent meaning.Another meaning for base is in solid geometry, such as a cylinder has a base (the circle part).
math is a really fun thing to do
Base=percentage divided by rate
Crossing, the same meaning that it has generally.
I don't know about math, but in physics and chemistry its a deciliter