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retrograde amnesia

noun
1.
a memory disorder characterized by an inability to remember events or experiences that occurred before a significant point in time.
Origin
1930-1935
1930-35
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for retro-grade amnesia

retrograde amnesia

noun
1.
amnesia caused by a trauma such as concussion, in which the memory loss relates to material learnt before the trauma Compare anterograde amnesia
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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retro-grade amnesia in Medicine

retrograde amnesia n.
A condition in which events that occurred before the onset of amnesia cannot be recalled.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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