Webster's English Dictionary

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opening

open.ing \'o-p-(*-)nin\ n 1a: an act or instance of making or becoming open 
    1b: an act or instance of beginning : COMMENCEMENT; esp : a  formal and 
   usu. public event by which something new is put officially into operation 
   2: something that is open : as  2a1: BREACH, APERTURE  2a2: an open width : 
   SPAN  2b: an area without trees or with scattered usu. mature trees that 
   occurs a s a break in a forest 2c: two pages that face one another in a 
   book  3: something that constitutes a beginning : as  3a: a planned series 
   of moves made at the beginning of a game of chess or c heckers 3b: a first 
   performance  4: OPPORTUNITY, OCCASION