Webster's English Dictionary

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closed

closed \'klo-zd\ aj 1: not open : ENCLOSED  2a: forming a self-contained 
   unit {~ association}  2b1: traced by a moving point that returns to an 
   arbitrary starting point  {~ curve}; also : so made that every plane 
   section is a closed curve {~ surface} 2b2: having elements subject to an 
   operation that produces again elements  of the set {set ~ under division} 
   3a: confined to a few {~ membership}  3b: rigidly excluding outside 
   influence {~ economy}  4: ending in a consonant {~ syllable}