[{"word":"mass-energy","phonetics":[],"meanings":[{"partOfSpeech":"noun","definitions":[{"definition":"Mass and energy as a unified concept.","synonyms":[],"antonyms":[]},{"definition":"(also spelled mass energy) The energy associated with any given mass according to special relativity, E = mc2.","synonyms":[],"antonyms":[]}],"synonyms":[],"antonyms":[]},{"partOfSpeech":"adjective","definitions":[{"definition":"Mass-to-energy","synonyms":[],"antonyms":[],"example":"Mass-energy conversion occurs during nuclear fusion and fission."}],"synonyms":[],"antonyms":[]}],"license":{"name":"CC BY-SA 3.0","url":"https://creativecommons.org/licenses/by-sa/3.0"},"sourceUrls":["https://en.wiktionary.org/wiki/mass-energy"]}]