market leader noun2 •A product that is chosen by more consumers than any of its competitors.The aim of the sophisticated type of own label is to present customers with a product which has at least as good a quality as the brand of the market leader. — 1995 •A company that manufactures or markets a market leader or that outsells all other similar businesses.Knorr, a Swiss company, is the dry soup market leader in Europe. — 2011 formsmarket leaders