The quality of having gaps or openings that allow leakage; figuratively, vulnerability to loss, interference or corruption

Latin porus, 'pore,' via French poreux, + the noun suffix -ity

Permeability Leakiness
Impermeability Imperviousness
"Between the budget poured in at the top and the village clinic at the bottom lies the porosity of the governance channel, the leakage that determines how much of the money actually arrives."

Effective in essays and GS2 answers on institutional leakage and last-mile delivery, e.g., 'reducing the porosity of the public distribution system required end-to-end digitisation through Direct Benefit Transfer.'

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