Etymology
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permeation (n.)

"act of permeating; state of being permeated," 1620s, noun of action from Latin permeare "to pass through" (see permeate).

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Definitions of permeation

permeation (n.)
the process of permeating or infusing something with a substance;
Synonyms: pervasion / suffusion
permeation (n.)
mutual penetration; diffusion of each through the other;
Synonyms: interpenetration
From wordnet.princeton.edu