Etymology
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epochal (adj.)

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

updated on September 20, 2012

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Definitions of epochal from WordNet

epochal (adj.)
highly significant or important especially bringing about or marking the beginning of a new development or era;
epochal decisions made by Roosevelt and Churchill
Synonyms: epoch-making
From wordnet.princeton.edu, not affiliated with etymonline.