adj

momentous

moh-MEHN-tuhs

Momentous (adj) means of great importance, especially because of lasting consequences. Example: “Signing the peace treaty was a momentous occasion for both nations.”

adj

Of great importance, especially because of lasting consequences.

"Signing the peace treaty was a momentous occasion for both nations."

"She made the momentous decision to leave her job and start a business."

How to use momentous

Learner’s notes

In plain EnglishHugely important or significant, often marking a turning point.

Common mistake

Don't confuse with "momentary" (brief) — momentous is about importance, not duration.

Easily confused with

momentary →

Common pairings

momentous occasion momentous decision momentous event

Word forms

more momentous comparative, most momentous superlative

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Fill the gap

Can you complete this real example?

Signing the peace treaty was a _____ occasion for both nations.

Etymology

From "moment" in the older sense of "weight, importance," plus the adjective suffix "-ous."

Rhymes for momentous

yous nous pious joyous heinous ominous curious anxious copious tenuous tedious spurious

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Frequently asked questions

What does “momentous” mean?

The word “momentous” means of great importance, especially because of lasting consequences. In plain terms, hugely important or significant, often marking a turning point.

How do you pronounce “momentous”?

“Momentous” is pronounced moh-MEHN-tuhs (/moʊˈmɛn.təs/ in IPA).

How do you use “momentous” in a sentence?

Here is “momentous” used in a sentence: “Signing the peace treaty was a momentous occasion for both nations.”

What part of speech is “momentous”?

“Momentous” is an adjective.