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.
Use 'point of sale (POS)' in a Sentence They were at the point of sale, which meant that the duties now resided with the buyer and not my dad, who was the seller. 16 people found this helpful The point of sale transaction involving the credit card in question had several records of the transaction taking place which was useful.