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[ep-uh-kuh l or, esp. British, ee-po-] /ˈɛp ə kəl or, esp. British, ˈi pɒ-/
of, relating to, or of the nature of an epoch.
extremely important, significant, or influential.
Origin of epochal
1675-85; epoch + -al1
Related forms
epochally, adverb
nonepochal, adjective
preepochal, adjective
unepochal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for epochal
Contemporary Examples
Historical Examples
  • Observe, then, that Davy made his epochal experiment of melting ice by friction when he was a youth of twenty.

  • The silence lengthened until it became acute, epochal, climactic.

    The Shadow Arthur Stringer
  • It was a bright morning; the week just ended had been, in a sense, epochal, and Wheaton resolved to go to church.

    The Main Chance Meredith Nicholson
  • The 1914 catalogue was epochal in the life of this big farmer.

    Plowing On Sunday Sterling North
  • The present civilization has reached this epochal—this transition—period.

  • In 1868, Westinghouse made his epochal invention, the railway air-brake.

    Invention Bradley A. Fiske
Word Origin and History for epochal

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

Online Etymology Dictionary, © 2010 Douglas Harper
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