the company or brand with the largest share of a market niche for a particular product
One company is becoming the market leader as the virtual evidence room for local police— Evidence.com.
And while Bing grew 24 percent over the last year, Google remains the market leader by a dominant margin.
In certain industries, all it takes is a market leader to act and others follow suit.
Becoming a market leader in any business is a hard feat, which is why so many turnarounds (and startups) fail.
Nevertheless, there are always people who will try to topple the market leader.
Buy for me now, Amalgamated Copper, the market leader, for all I'm worth!