Medical Definition of long–term memory
: memory that involves the storage and recall of information over a long period of time (as days, weeks, or years) <A short-term memory's conversion to a long-term memory requires changes within the brain that protect the memory from interference from competing stimuli or disruption from injury or disease.—Alison Preston, Scientific American, December 2007> <But the mystery remains: how do cells in the cortex physically lay down long-term memories?—Sandra Blakeslee, The New York Times, 14 Nov. 2000>—abbreviation LTM; compare short-term memory
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