Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
insomuch is an adverb meaning "to such an extent or degree; so". It carries one recorded sense.
to such an extent or degree; so
Definitions, synonyms and semantic relations for insomuch come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.