momentous
mo·men·tous
adjective
1.
of very great significance
- “deciding to drop the atom bomb was a very big decision”
- “a momentous event”
Origin
From moment (“weight, importance”) + -ous.
Related words
Word family
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.