twelve twelve /ˈtwɛlv/

adjective

1. () Denoting a quantity consisting of 12 items or units  ( xii , dozen , twelve , 12 )
   denoting a quantity consisting of 12 items or units
     The twelve-month calendar hung on the wall.
   The twelve-month calendar hung on the wall.
   

noun

1. () The cardinal number that is the sum of eleven and one  ( XII , twelve , 12 , dozen )
   the cardinal number that is the sum of eleven and one
    There are twelve months in a year
   There are twelve months in a year