Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
thing-in-itself is a noun meaning "the intellectual conception of a thing as it is in itself, not as it is known through perception". It carries one recorded sense.
Definitions, synonyms and semantic relations for thing-in-itself come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.