[{"word":"perestroika","phonetic":"/pɛɹ.ɪˈstɹɔi.kə/","phonetics":[{"text":"/pɛɹ.ɪˈstɹɔi.kə/","audio":""}],"meanings":[{"partOfSpeech":"noun","definitions":[{"definition":"(singularity theory) A situation where a small variation of parameters leads to a sudden change in properties.","synonyms":[],"antonyms":[]}],"synonyms":[],"antonyms":[]},{"partOfSpeech":"proper noun","definitions":[{"definition":"A program of political and economic reform carried out in the Soviet Union in the 1980s and early 1990s under the leadership of Mikhail Gorbachev.","synonyms":[],"antonyms":[]},{"definition":"The period of time in the Soviet Union during which these reforms were carried out and in effect.","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/perestroika"]}]