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say it: pur-VAY-siv-nis
pervasiveness is a noun meaning "the quality of filling or spreading throughout". It carries one recorded sense.
the quality of filling or spreading throughout
“the pervasiveness of the odor of cabbage in tenement hallways”
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 pervasiveness 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.