[1] : WordNet (r) 2.0

hexadecimal
     adj : of or pertaining to a number system having 16 as its base
           syn: hex
see also:
hex 

[2] : Jargon File (4.3.1, 29 Jun 2001)

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.

[3] : The Free On-line Dictionary of Computing (27 SEP 03)

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.
     
        for example, hexadecimal bead is decimal 48813:
     
        	digit    weight        value
        	b = 11   16^3 = 4096   114096 = 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
        					 -----
        				bead   = 48813
     
        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
        bit-masks, machines addresses, and other low-level constants
        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
     
     
see also:
base c binary bit-masks ibm octal 
jargon file 

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