[{"word":"theta","phonetic":"/ˈθiːtə/","phonetics":[{"text":"/ˈθiːtə/","audio":""},{"text":"/ˈθeɪtə/","audio":"https://api.dictionaryapi.dev/media/pronunciations/en/theta-us.mp3","sourceUrl":"https://commons.wikimedia.org/w/index.php?curid=311281"}],"meanings":[{"partOfSpeech":"noun","definitions":[{"definition":"The eighth letter of the Modern Greek alphabet, ninth in Old Greek: Θ, θ.","synonyms":[],"antonyms":[]},{"definition":"The measure of an angle.","synonyms":[],"antonyms":[]},{"definition":"The sensitivity of the value of a derivative with respect to time; the \"time decay\".","synonyms":[],"antonyms":[]},{"definition":"Designating a level of brain activity as measured by electroencephalography having a frequency of between four and seven cycles per second (associated with drowsiness in adults).","synonyms":[],"antonyms":[]},{"definition":"The voiceless dental fricative represented by θ.","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/theta"]}]