mo·men·tous

[moh-men-tuhs]
adjective
of great or far-reaching importance or consequence: a momentous day.

Origin:
1645–55; moment + -ous

mo·men·tous·ly, adverb
mo·men·tous·ness, noun
un·mo·men·tous, adjective
un·mo·men·tous·ly, adverb
un·mo·men·tous·ness, noun


vital, critical, crucial, serious. See heavy.


trivial, trifling.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
momentous (məʊˈmɛntəs) [Click for IPA pronunciation guide]
 
adj
of great significance
 
mo'mentously
 
adv
 
mo'mentousness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Momentous is always a great word to know.
So is ninnyhammer. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a fool or simpleton; ninny.
Etymonline
Word Origin & History

momentous
formed 1650s in English from moment to carry the sense of "important" while momentary kept the meaning "of an instant of time."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
These thoughts concern themselves only with things that seem important and of
  momentous interest to us.
One momentous case down, another equally historic decision to go.
It was a momentous and eventful day to all upon our plantation.
Today, however, a second and equally momentous shift is needed.
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