(Reklam) A company that has achieved a dominant position - either in scale (e.g., British Airways) or influence (e.g., Virgin) - within its field. This leading position often comes about because the company was the first to market a certain type of product and, with the protection of a patent, has managed to consolidate its position before direct competition was possible. Alternatively, a company may overtake a previous market leader through greater efficiency and skilful positioning
A market leader is a company that sells more of a particular product or service than most of its competitors do. We are becoming one of the market leaders in the fashion industry. the company that sells the most of a particular type of product, or the product that is the most successful one of its type