momentously

momentous

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

Origin:
1645–55; moment + -ous

momentously, adverb
momentousness, noun
unmomentous, adjective
unmomentously, adverb
unmomentousness, noun


vital, critical, crucial, serious. See heavy.


trivial, trifling.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
momentous (məʊˈmɛntəs)
 
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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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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