dark agen.1. Dark Agesa. The period in Europe from the fall of Rome in the fifth century ad to the restoration of relative political stability around the year 1000; the early part of the Middle Ages.b. The entire Middle Ages, especially when viewed as a troubled period marked by the loss of classical learning. No longer in use by historians.2. often dark agesa. An era of ignorance, superstition, or social chaos or repression: a novel depicting the dark ages in the aftermath of a global war.b. The early or crude stage in the history or development of something: back in the dark ages of radio technology.3. Dark Ages The period in the history of the universe, roughly the second 500 million years according to current cosmological models, when all matter was in the form of neutral hydrogen and helium atoms, but no stars or galaxies had formed.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.Dark Ages pl n 1. (Historical Terms) the period from about the late 5th century ad to about 1000 ad, once considered an unenlightened period 2. (Historical Terms) (occasionally) the whole medieval period Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014Dark? Ag?es n. 1. the period in European history from about A.D. 476 to about 1000. 2. the whole of the Middle Ages, from about A.D. 476 to the Renaissance. 3. (often l.c.) a period or stage marked by repressiveness, a lack of advanced knowledge, etc. [1720?30] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.