ˌmarket ˈleader BrE AmE noun [countable]
the company that sells the most of a particular type of product, or the product that is the most successful one of its type:
the UK market leader in sports shoes
ˌmarket ˈleader BrE AmE noun [countable]
the company that sells the most of a particular type of product, or the product that is the most successful one of its type:
the UK market leader in sports shoes
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012