When referring to engineering, permeation is the penetration of a permeate through a solid. A permeate can be a solid, a liquid, or a gas. Permeation can be measured using a minipermeameter.

The noun form for the verb permeate is permeation.

permeation through the plasma membrane perhaps?

The words sought may be permutation or permeation. (see related questions)

There is no such term as perminations. The closest term would be permeation, which is the act of penetrating a substance.