Definition of dark age
1 : a time during which a civilization undergoes a decline: such asa Dark Ages plural : the European historical period from about a.d. 476 to about 1000; broadly : middle agesb or Dark Age : the Greek historical period of three to four centuries from about 1100 b.c. —often plural
2 or Dark Age a : the primitive period in the development of something —usually plural <in the dark ages of medicine>b : a state of stagnation or decline —usually plural
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