Etymology

permeance

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Today it means: A measure of the degree to which a material allows a fluid to permeate it. Full definition →

Latin permeare
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The story

  1. Latin · derived frompermeare“to penetrate”
  2. English todaypermeance

From stem of Latin permeare (“to penetrate”) + -ance.

Etymology from Wiktionary, CC BY-SA 4.0.