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}
Webster's English Dictionary