[1] : The Collaborative International Dictionary of English v.0.48

twelve \twelve\, a. oe. twelve, twelf, as. twelf; akin to
   ofries. twelf, twelef, twilif, os. twelif, d. twaalf, g.
   zw"olf, ohg. zwelif, icel. t=olf, sw. tolf, dan. tolv,
   goth. twalif, from the root of e. two + the same element as
   in the second part of e. eleven. see two, and eleven.
   one more that eleven; two and ten; twice six; a dozen.
   1913 webster

   twelve-men's morris. see the note under morris.

   twelve tables. rom. antiq. see under table.
      1913 webster
see also:
two eleven twelve-men's morris morris twelve tables table 

[2] : The Collaborative International Dictionary of English v.0.48

twelve \twelve\, n.
   1. the number next following eleven; the sum of ten and two,
      or of twice six; twelve units or objects; a dozen.
      1913 webster

   2. a symbol representing twelve units, as 12, or xii.
      1913 webster

   the twelve script., the twelve apostles. --matt. xxvi.
      20.
      1913 webster
see also:
the twelve 

[3] : WordNet (r) 2.0

twelve
     adj : denoting a quantity consisting of 12 items or units syn: 12,
            xii, dozen
     n : the cardinal number that is the sum of eleven and one syn:
         12, xii, dozen
see also:
12 xii dozen xii 

Twelve >> T Words
Twelve, definition of term: Twelve
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Twelve Tables >> T Words
Twelve Tables, definition of term: Twelve Tables
twelve+tables_pag1.html

The Twelve >> T Words
The Twelve, definition of term: The Twelve
the+twelve_pag1.html