Theta Daniel Guidotti 14 years ago ThetaThis is the ratio of the price of an option with decrease in expiration time. Also known as time decay.Random Finance Terms for the Letter TTerm TrustTerminal ValueTerms of SaleTerms of TradeThe Global DowTheoretical Futures PricesTheoretical Spot Rate CurveThetaThe World BankThin MarketRecommended for you:Theoretical Spot Rate CurveThin MarketTerminal ValueTerms of Trade