Definition of permeation in US English:

permeation

noun

  • See permeate

    • ‘It's a funny, left-of-center film about envy in all its permeations and how it strains friendships.’
    • ‘Ion permeation is slow on a molecular timescale.’
    • ‘The carcinoid component was negative for both lymphatic and vascular permeations.’
    • ‘According to the simplest scenario, the blocking process can be viewed as being completely independent from permeation.’
    • ‘More generally it connotes networks and their mode of functioning, the forms of their permeation and manipulation.’

Pronunciation

permeation

/ˌpərmēˈāSH(ə)n//ˌpərmiˈeɪʃ(ə)n/