Origin of thetaClassical Greek th?ta: of Semitic origin, originally , akin to Classical Hebrew (language) tet
Origin of thetaGreek th&emacron;ta, of Phoenician origin; akin to Hebrew &tlowdot;êt, teth.
From the Ancient Greek θῆτα (thēta).
theta - Investment & Finance Definition
Measures the change in the premium of an option and compares it to a one-day change in time-to-maturity. The longer an option’s time to expiration, the more valuable an option is. High theta options are favored by option sellers because options have a high rate of time decay.