leftover noun 2adjective 1forms 1 noun2 •Something left behind; an excess or remainder.It's a leftover from yesterday, but it's still perfectly good. •[in the plural] Remaining after a meal is complete or eaten for a later meal or snack.Not leftovers again!The entire wheel of cheese is a leftover from the party. adjective1 •Remaining; left behind; extra; odd; in reserve.Do you want some of the leftover supplies from the event?I have some leftover spaghetti in the fridge, so I don't plan to cook tonight. formsleftovers