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epoch-making

[ep-uh k-mey-king or, esp. British, ee-pok-] /ˈɛp əkˌmeɪ kɪŋ or, esp. British, ˈi pɒk-/
adjective
1.
opening a new era, as in human history, thought, or knowledge; epochal:
an epoch-making discovery.
Origin
1870-1875
1870-75
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for epochmaking

epoch-making

adjective
1.
of great importance; momentous
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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