permittance

From permit +‎ -ance.

permittance (countable and uncountable, plural permittances)

1. The act of permitting; allowance; permission; leave.
   • 1643, J[ohn] M[ilton], The Doctrine and Discipline of Divorce: […], London: […] T[homas] P[aine] and M[atthew] S[immons] […], →OCLC:

     Thus we see how this unclean permittance defeats the sacred and glorious end both of the moral and judicial law

2. (electricity) The power of a dielectric to permit or enhance induction.

• pentametric