[{"word":"rapidity","phonetic":"/ɹəˈpɪdɪti/","phonetics":[{"text":"/ɹəˈpɪdɪti/","audio":""}],"meanings":[{"partOfSpeech":"noun","definitions":[{"definition":"Speed, swiftness; the condition of being rapid","synonyms":[],"antonyms":[]},{"definition":"A measure of velocity relative to the speed of light","synonyms":[],"antonyms":[]},{"definition":"A measure of the velocity of a particle in a beam relative to the beam's axis","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/rapidity"]}]