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The Collaborative International Dictionary
Perviousness

Perviousness \Per"vi*ous*ness\, n. The quality or state of being pervious; as, the perviousness of glass.
--Boyle.

Wiktionary
perviousness

n. The quality or state of being pervious.

WordNet
perviousness

n. the permeability of something that can be penetrated by a liquid [syn: penetrability] [ant: impenetrability, impenetrability]

Usage examples of "perviousness".

Taking as a model the expression 'transparent' for the perviousness of a substance to light, we may say that the air, when in a state of acoustic vibration, becomes 'trans-audient' for astral impulses, and that the nature of these vibrations determines which particular impulses are let through.