noun
Technical term used in physics, materials science, and related fields. Refers to the property of allowing light or other substances to pass through.
このフィルムは高い透過性を持っている。
This film has high transparency.
膜の透過性を測定する実験を行った。
We conducted an experiment to measure the permeability of the membrane.
透過 is the verb/noun meaning 'penetration' or 'transmission'; 透過性 adds the suffix 性 to indicate the property or degree of that quality.
Compound of 透過 (penetration, transmission) and 性 (property, nature). The word is a modern technical coinage based on Chinese-derived morphemes.