fifteen /ˈfɪf.tiːn/number 1noun 1forms 1 number1 •the number 15The fifteen men are, of course, the fifteen allies and the dead man's chest is the strategic principle on which their alliance is founded and which is now moribund. — 1960 noun1 •(Ireland) An Irish traybake made with crushed digestive biscuits, marshmallows and glacé cherries combined with condensed milk and desiccated coconut. formsfifteens
