[{"word":"rarefactions","phonetics":[],"meanings":[{"partOfSpeech":"noun","definitions":[{"definition":"A reduction in the density of a material, especially that of a fluid.","synonyms":[],"antonyms":[]}],"synonyms":[],"antonyms":["compression"]}],"license":{"name":"CC BY-SA 3.0","url":"https://creativecommons.org/licenses/by-sa/3.0"},"sourceUrls":["https://en.wiktionary.org/wiki/rarefaction","https://en.wiktionary.org/wiki/rarefactions"]}]