a market 'leader' [=a product or company that is more successful than all competing products or companies]
He is the league 'leader' in home runs. [=he has the most home runs in the league]
He's a 'born/natural leader'. [=someone who has qualities that a good leader has]
(..) a lock-in! Now! PILOT: This is crazy. ASHDOWN: John Connor. Prophesized leader of the Resistance. Soldier, you put every man and woman in this sub in jeopardy... ...with your little frogman stunt. Let's get one thing straight. (..)2009 Terminator Salvation