So significant and momentous as to characterize the beginning of a period: the President's epoch-making trip to China; epoch-making new technologies. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "epoch-making" in a sentence
"In Athens, the epoch-making "People's Revolution" in 508 B.C. resulted in democracy—the strongest form of republicanism the world had ever known—which meant universal native adult male franchise and a commitment to the principles of equal votes and freedom of speech and association."
"In the early hours I read in the paper of epoch-making projects"
"But the best comes last: "For the Love of You Pts. 1 & 2" was one of the two biggest hit singles from 1975's epoch-making The Heat Is On, the other being "Fight the Power". posted by Matthew @ 9: 00 AM"