D defs.my
Entry 1 sense Webster, 1913

Permeation

· Per·me·a·tion · IPA
01 n. The act of permeating, passing through, or spreading throughout, the pores or interstices of any substance.
  1. 1.
    The act of permeating, passing through, or spreading throughout, the pores or interstices of any substance.
    “Here is not a mere involution only, but a spiritual permeation and inexistence.” Bp. Hall.