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Definition of closed
not open:rooms with closed doors lined the hallway he sat with his eyes closed (of a business) having ceased trading, especially for a short period:he put the “Closed” sign up on the door (of a society or system) not communicating with or influenced by others; independent. limited to certain people; not open or available to all:the UN Security Council met in closed session unwilling to accept new ideas:you’re facing the situation with a closed mind Mathematics (of a set) having the property that the result of a specified operation on any element of the set is itself a member of the set. Mathematics (of a set) containing all its limit points. Geometry of or pertaining to a curve whose ends are joined.