1. the quality or state of being able to be penetrated or passed through
2. the ability to be understood or comprehended

Examples

• The penetrability of the soil determines how well water can drain through it.
• Scientists tested the penetrability of various materials to radiation.
• The penetrability of the ancient text made it accessible to modern readers.
• The fabric’s penetrability allowed air to flow through easily.
• Researchers studied the penetrability of cell membranes to different molecules.
• The penetrability of his argument convinced even the skeptics.