relating to or using a number system whose base is 16 rather than 10
noun also called: hexadecimal notation
2.
a number system having a base 16; the symbols for the numbers 0–9 are the same as those used in the decimal system, and the numbers 10–15 are usually represented by the letters A–F. The system is used as a convenient way of representing the internal binary code of a computer
hexadecimal in American English
(ˌhɛksəˈdɛsəməl)
adjective
designating or of a number system in which the base used is 16