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epochal

[ep-uh-kuh l or, esp. British, ee-po-] /ˈɛp ə kəl or, esp. British, ˈi pɒ-/
adjective
1.
of, relating to, or of the nature of an epoch.
2.
extremely important, significant, or influential.
Origin of epochal
1675-1685
1675-85; epoch + -al1
Related forms
epochally, adverb
nonepochal, adjective
preepochal, adjective
unepochal, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Word Origin and History for epochal
adj.

1680s, from epoch + -al (1).

Online Etymology Dictionary, © 2010 Douglas Harper
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14
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