collective memory

noun

a memory or memories shared or recollected by a group, as a community or culture.

any collection of memories passed from one generation to the next.

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British Dictionary definitions for collective memory

collective memory

noun

the shared memories of a group, family, race, etc

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