Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
fastidiousness is a noun meaning "the trait of being meticulous about matters of taste or style". It carries one recorded sense.
the trait of being meticulous about matters of taste or style
“neatness and fastidiousness of dress”
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 fastidiousness come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.