Wordnet 3.0

1. of or pertaining to a number system having 16 as its base;

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adj 1: of or pertaining to a number system having 16 as its base

The Jargon File (version 4.4.7, 29 Dec 2003):hexadecimal
n.

Base 16. Coined in the early 1950s to replace earlier sexadecimal, which
was too racy and amusing for stuffy IBM, and later adopted by the rest of
the industry.

Actually, neither term is etymologically pure. If we take binary to be
paradigmatic, the most etymologically correct term for base 10, for
example, is ?denary?, which comes from ?deni? (ten at a time, ten each), a
Latin distributive number; the corresponding term for base-16 would be
something like ?sendenary?. ?Decimal? comes from the combining root of
decem, Latin for 10. If wish to create a truly analogous word for base 16,
we should start with sedecim, Latin for 16. Ergo, sedecimal is the word
that would have been created by a Latin scholar. The ?sexa-? prefix is
Latin but incorrect in this context, and ?hexa-? is Greek. The word octal
is similarly incorrect; a correct form would be ?octaval? (to go with
decimal), or ?octonary? (to go with binary). If anyone ever implements a
base-3 computer, computer scientists will be faced with the unprecedented
dilemma of a choice between two correct forms; both ternary and trinary
have a claim to this throne.

The Free On-line Dictionary of Computing (18 March 2015):hexadecimal

(Or "hex") Base 16.  A number representation
using the digits 0-9, with their usual meaning, plus the
letters A-F (or a-f) to represent hexadecimal digits with
values of (decimal) 10 to 15.  The right-most digit counts
ones, the next counts multiples of 16, then 16^2 = 256, etc.

digit    weight        value
B = 11   16^3 = 4096   11*4096 = 45056
E = 14   16^2 =  256   14* 256 =  3584
A = 10   16^1 =   16   10*  16 =   160
D = 13   16^0 =    1   13*   1 =    13
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There are many conventions for distinguishing hexadecimal
numbers from decimal or other bases in programs.  In C for
example, the prefix "0x" is used, e.g. 0x694A11.

Hexadecimal is more succinct than binary for representing
but it is still reasonably easy to split a hex number into
different bit positions, e.g. the top 16 bits of a 32-bit word
are the first four hex digits.

The term was coined in the early 1960s to replace earlier
"sexadecimal", which was too racy and amusing for stuffy
IBM, and later adopted by the rest of the industry.

Actually, neither term is etymologically pure.  If we take
"binary" to be paradigmatic, the most etymologically correct
term for base ten, for example, is "denary", which comes from
"deni" (ten at a time, ten each), a Latin "distributive"
number; the corresponding term for base sixteen would be
something like "sendenary".  "Decimal" is from an ordinal
number; the corresponding prefix for six would imply something
like "sextidecimal".  The "sexa-" prefix is Latin but
incorrect in this context, and "hexa-" is Greek.  The word
octal is similarly incorrect; a correct form would be
"octaval" (to go with decimal), or "octonary" (to go with
binary).  If anyone ever implements a base three computer,
computer scientists will be faced with the unprecedented
dilemma of a choice between two *correct* forms; both
"ternary" and "trinary" have a claim to this throne.

[Jargon File]

(1996-03-09)
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