This seemed to be a great and momentous discovery, nearly on a level with the theory of relativity.

It happened only a few weeks after Aristotle made that first momentous discovery.

The moment before sleep claimed her, she knew that she was on the threshold of a great and momentous discovery.

Then one day he made an even more momentous "discovery."

And it was Hayward who made a momentous discovery.

If true, it would be a momentous discovery.

Abruptly she stopped laughing as she in her turn made a momentous discovery.

At the age of 5 he makes the momentous discovery that he is "Moy."

Other astronomers were guarded in their reaction to such a potentially momentous discovery.

We realized that this was one of the most momentous discoveries in the history of science.