permeance

UK: /ˈpɜːmɪəns/ US: (pûr′mē əns)

WordReference Random House Unabridged Dictionary of American English © 2026

per•me•ance  (pûr′mē əns), n. 

1. the act of permeating.
2. Electricity the conducting power of a magnetic circuit for magnetic flux;
   the reciprocal of magnetic reluctance.

• perme(ant) + -ance 1835–45

Collins Concise English Dictionary © HarperCollins Publishers::

permeance / ˈpɜːmɪəns/ noun

1. the act of permeating
2. the reciprocal of the reluctance of a magnetic circuit
   Symbol: Λ

ˈpermeant adjective , noun