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retrograde amnesia

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noun
  1. a memory disorder characterized by an inability to remember events or experiences that occurred before a significant point in time.
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Origin of retrograde amnesia

First recorded in 1930–35
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for retrograde amnesia

retrograde amnesia

noun
  1. amnesia caused by a trauma such as concussion, in which the memory loss relates to material learnt before the traumaCompare anterograde amnesia
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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

retrograde amnesia in Medicine

retrograde amnesia

n.
  1. A condition in which events that occurred before the onset of amnesia cannot be recalled.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.