Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
comprehensiveness is a noun meaning "completeness over a broad scope". It carries 2 recorded senses.
completeness over a broad scope
the capacity to understand a broad range of topics
“a teacher must have a breadth of knowledge of the subject”
“a man distinguished by the largeness and scope of his views”
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 comprehensiveness come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.