Epochal Definition
 ĕpə-kəl, -ŏkəl 
    adjective
  
 Of or characteristic of an epoch.
 American Heritage 
Highly significant or important; momentous.
 Epochal decisions made by Roosevelt and Churchill.
 American Heritage 
Without parallel.
 Epochal stupidity.
 American Heritage 
Of or pertaining to an epoch.
Wiktionary 
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