It had been the most momentous day of his life.

This is the most momentous decision that any political leader would ever have to make and decide we must.

She was associated with the film company during its most momentous years.

He felt, somehow, that the step toward her was the most momentous of his life.

You're about to see the most momentous thing in all modern science.

"I don't exactly consider it the most momentous event in the history of the republic."

In the long term, this final measure was the most momentous of all.

Economic and monetary union will be a most momentous step.

Europe has come a long way over the past 40 years but today's decision is undoubtedly one of the most momentous ever taken.

This would be the most momentous assignment of his life.