[{"word":"tetrachord","phonetics":[],"meanings":[{"partOfSpeech":"noun","definitions":[{"definition":"Any set of four different pitch classes.","synonyms":[],"antonyms":[]},{"definition":"A series of four sounds, forming a scale of two-and-a-half tones.","synonyms":[],"antonyms":[]}],"synonyms":[],"antonyms":[]}],"license":{"name":"CC BY-SA 3.0","url":"https://creativecommons.org/licenses/by-sa/3.0"},"sourceUrls":["https://en.wiktionary.org/wiki/tetrachord"]}]