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