market leader
noun /ˌmɑːkɪt ˈliːdə(r)/
/ˌmɑːrkɪt ˈliːdər/
- the company that sells the largest quantity of a particular kind of product
- We are the market leader in hi-fi.
- a product that is the most successful of its kind
- The system is the market leader in the home PC market.