fifty-fifty adjective 2adverb 1noun 3forms 1 adjective2 •Half and half.In this recipe, the flour and sugar are fifty-fifty.In this recipe, the flour and sugar are in fifty-fifty proportions. •Used to describe two possible outcomes as being equally likely.It is fifty-fifty that the employee who made the mistake will end up fired. adverb1 •In half: in two equal parts, shares, etc.I'll handle production, you handle sales, and we'll split profits fifty-fifty. noun3 •A challenge between two opposing players, where both have an equal chance of taking possession. •Ellipsis of fifty-fifty grind, a rail or edge grind, using both trucks to grind along, longitudinally aligned. •Ellipsis of fifty-fifty slide, a rail slide where the snowboard is longitudinally aligned with the direction of the slide, down the centerline. formsfifty-fifties