1. the quality or state of allowing liquids or gases to pass through
2. the degree to which a material allows fluids to flow through it
Usage: scientific; technical

Examples

• The soil’s high permeability allows water to drain quickly after rain.
• Engineers tested the rock’s permeability before drilling the well.
• The membrane’s permeability to oxygen makes it ideal for medical applications.
• Clay has low permeability compared to sand and gravel.
• The permeability of the fabric determines how breathable the clothing will be.
• Scientists measured the permeability of different building materials to moisture.
• The concrete’s permeability was reduced by adding special sealants.