1. (Naut.) A space amidships used to keep blocks, ropes, etc.; a space on a ship belonging to no one in particular to care for. [ 1913 Webster ]

2. An unoccupied area between opposing armies. [ WordNet 1.5 ]

3. Hence: (Fig.): An unclaimed space or time. [ 1913 Webster ]

That no-man's land of twilight. W. Black. [ 1913 Webster ]