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momentous

[moh-men-tuh s] /moʊˈmɛn təs/
adjective
1.
of great or far-reaching importance or consequence:
a momentous day.
Origin
1645-1655
1645-55; moment + -ous
Related forms
momentously, adverb
momentousness, noun
unmomentous, adjective
unmomentously, adverb
unmomentousness, noun
Synonyms
vital, critical, crucial, serious. See heavy.
Antonyms
trivial, trifling.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for un momentous

momentous

/məʊˈmɛntəs/
adjective
1.
of great significance
Derived Forms
momentously, adverb
momentousness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for un momentous

momentous

adj.

1650s, from moment + -ous to carry the sense of "important" while momentary kept the meaning "of an instant of time." Related: Momentously; momentousness.

Online Etymology Dictionary, © 2010 Douglas Harper
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