Bill Clinton's signal contribution to this debate was to construct a new and powerful centrist position.

The bank's signal contribution to the economy, he said, is to tamp down prices.

Meara's signal contribution to her field, however, came in the area of ethics.

They both made signal contributions to that victory.

He has made a signal contribution to knowledge and understanding of one of the greatest periods of Italian art.

Despite the lack of international judicial uniformity on several important issues, the Hague Rules made a signal contribution to international trade.

She said "Harry Schwarz will be remembered for his signal contribution to the development of our democracy.

President Gorbachev will be remembered for four signal contributions.

Indeed, jazz, now about 100 years old, is among the signal contributions of 20th-century America to world culture.

But popular culture remains America's signal cultural contribution to the world.