[{"word":"half-life","phonetic":"/ˈhæfˌlaɪf/","phonetics":[{"text":"/ˈhæfˌlaɪf/","audio":""}],"meanings":[{"partOfSpeech":"noun","definitions":[{"definition":"The time required for half of the nuclei in a sample of a specific isotope to undergo radioactive decay.","synonyms":[],"antonyms":[]},{"definition":"In a chemical reaction, the time required for the concentration of a reactant to fall from a chosen value to half that value.","synonyms":[],"antonyms":[]},{"definition":"The time it takes for a substance (drug, radioactive nuclide, or other) to lose half of its pharmacological, physiologic, or radiological activity.","synonyms":[],"antonyms":[]},{"definition":"The time it takes for an idea or a fashion to lose half of its influential power.","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/half-life"]}]