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1. Of or characteristic of an epoch.
a. Highly significant or important; momentous: epochal decisions made by Roosevelt and Churchill.
b. Without parallel: epochal stupidity.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ep•och•al(ˈɛp ə kəl; esp. Brit. ˈi pɒ-)
1. of, pertaining to, or of the nature of an epoch.
2. extremely important, significant, or influential.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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|Adj.||1.||epochal - highly significant or important especially bringing about or marking the beginning of a new development or era; "epochal decisions made by Roosevelt and Churchill"; "an epoch-making discovery"|
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