porpoise noun [C]. âº a âmammal that âlives in the âsea, âswims in âgroups, and âlooks âsimilar to a dolphin but has a âshorter ârounder ânose. (Definition of porpoise from the Cambridge Advanced Learnerâs Dictionary & Thesaurus Â© Cambridge University Press). See all translations.
Definition of point of no return. 1  1 : the point in the flight of an aircraft beyond which the remaining fuel will be insufficient for a return to the starting point with the result that the craft must proceed. 2  2 : a critical point at which turning back or reversal is not possible.
Real Risk-Free Rate of Return. Real Risk-Free Rate of Return. The risk-free rate of return after taking inflation into account. For example, if the risk-free rate of return is 3% and the inflation rate is 2%, the real risk-free rate of return is 1%. Because the risk-free rate is low in the first place, the real return can sometimes be negative, particularly in times of high inflation.