say it: pur-mee-uh-BIL-i-tee
permeability is a noun meaning "the property of something that can be pervaded by a liquid (as by osmosis or diffusion)". It carries one recorded sense.
the property of something that can be pervaded by a liquid (as by osmosis or diffusion)
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for permeability come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.