The phrase "momentous time" refers to an important and significant period or event that makes a big impact or brings about significant changes.
Sentences with «momentous time»
That awkward, momentous time in your life when you're treated like an alien by everyone around you, even though you know deep down you're as funky fresh as it gets. (firstshowing.net)
These are momentous times for Gill and others like him in timekeeping laboratories around the world. (newscientist.com)
As we await his ruling, munis face a truly momentous time. (cnbc.com)