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epoch  (epochs plural )If you refer to a long period of time as an epoch, you mean that important events or great changes took place during it.  n-count 
The birth of Christ was the beginning of a major epoch of world history.  


epoch-making  
An epoch-making change or declaration is considered to be the extremely important because it is likely to have a significant effect on a particular period of time.  adj 
It was meant to sound like an epoch-making declaration.