Definition of "water-tightness" [water-tightness]

• The property of being water-tight. (noun)

The Century Dictionary (Public Domain)

• "The company also promised to install additional emergency backup generators and other equipment and improve water-tightness of the reactor building."
• "It will also install additional backup generators and other emergency equipment to secure cooling capacity, and improve water-tightness of reactor buildings."
• "Battens: The setting of battens is the most important part of MCR roofing on which the proper laying of the tiles and water-tightness depend."