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Syllable division and stress derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
externality is a noun meaning "the quality or state of being outside or directed toward or relating to the outside or exterior". It carries one recorded sense.
the quality or state of being outside or directed toward or relating to the outside or exterior
“the outwardness of the world”
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 externality come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.