1. the quality or state of being plumb; exact verticality or perpendicularity.
Usage: technical; construction and carpentry
2. the quality of being accurate, correct, or precise.
Usage: figurative; less common

Examples

• The carpenter checked the plumbness of the wall with a level.
• The plumbness of the door frame ensures it will close properly.
• We tested the plumbness of each vertical support before proceeding.
• The architect verified the plumbness of the building's corners.
• Any deviation from plumbness would affect the structural integrity.
• The plumbness of his reasoning was evident in his logical argument.