With those few words well before dawn on Friday, David Cameron announced a momentous shift in Britain's relationship with the European Union.

How Mr. Hallinan's ideas will translate into crime fighting remains to be seen, but they leave this city's law-enforcement establishment facing a possibly momentous shift.

A momentous shift is taking place in the investment practices of black Americans.

Historians often focus on leadership struggles in Beijing to explain such momentous shifts in policy.

But the idea that Israel's interests are driving one of the most momentous shifts in America's foreign policy is simple-minded and offensive.

This momentous shift took 300 years from church to factory, say, 1360 to 1660.

At that moment, huge forces in the world were on the verge of momentous shifts.

That simple but momentous shift in perception was the newest thing in all the New Deal, and the most consequential too.

That is a momentous shift.

In the few months since a study of a widely used hormone regimen found that its risks outweighed its benefits, the prevailing view of menopause has undergone a momentous shift.