Dr Andrew Taylor, the Director of Isis, says it achieved its world leading position by building upon the achievements of the accelerators developed for particle physics in the 1970s.

BBC: Making 'ghosts' in a machine

There is a real question whether America will be able to emerge from this meltdown and restore its leading economic position in the world.

FORBES: Magazine Article

But it would be extraordinary if America sacrificed its position as the world's leading military power as the result of a legislative accident.

ECONOMIST: Lexington

This will also affect London which may have won the crown as world leading financial services centre but that position is very precarious.

BBC: City Diaries: 15 October

In spite of its leading position, Danisco has a share of the world ingredients market estimated by analysts at a mere 6%.

ECONOMIST: Danisco: Cluster buster | The

If that makes the world's leading Web-crawler sound judgmental, consider Google's difficult position.

FORBES: Magazine Article

During the second quarter, Lenovo grew its number-one position in China, the world's largest PC market, to a leading market share of 34 percent, up 2.4 points year-over-year.

ENGADGET: Lenovo Q2 earnings reveal record high sales of $8.7 billion, highest-ever PC market share