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Hexadecimal describes a base-16 number system. That is, it describes a numbering system containing 16 sequential numbers as base units (including 0) before ...
http://whatis.techtarget.com/definition/hexadecimal
In mathematics and computing, hexadecimal (also base 16, or hex) is a positional numeral system with a radix, or base, of 16. It uses sixteen distinct symbols, ...
http://whatis.techtarget.com/definition/hexadecimal
Refers to the base-16 number system, which consists of 16 unique symbols: the numbers 0 to 9 and the letters A to F.
http://dictionary.reference.com/browse/hexadecimal
The hexadecimal number system is one that uses 16 symbols (0-9 and A-F) to represent a value. ... Definition of Hexadecimal & How to Count in Hexadecimal.
http://dictionary.reference.com/browse/hexadecimal