noun🔗ShareThe eighth letter of the Modern Greek alphabet, ninth in Old Greek: Θ, θ.""In Greek class, we learned that theta is the eighth letter of the alphabet." "languagemathChat with AIVocabulary GamePractice Reading
noun🔗ShareThe measure of an angle."The math problem asks us to find theta, which is the angle of the triangle. "mathscienceChat with AIVocabulary GamePractice Reading
noun🔗ShareThe sensitivity of the value of a derivative with respect to time; the "time decay"."The option's theta was significant; each day, its value decreased noticeably due to time decay. "financebusinessmathtimeChat with AIVocabulary GamePractice Reading
noun🔗ShareDesignating 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)."As the meditation session deepened, the brainwave monitor showed a shift from alpha to theta, indicating increased relaxation and a state close to sleep. "physiologymindmedicinefrequencysensationChat with AIVocabulary GamePractice Reading
noun🔗ShareThe voiceless dental fricative represented by θ."In phonetics class, we practiced making the "th" sound in "thin," which is represented by the Greek letter theta. "phoneticslanguagelinguisticswordChat with AIVocabulary GamePractice Reading
