memory (n.)

late 13c., "recollection (of someone or something); remembrance, awareness or consciousness (of someone or something)," also "fame, renown, reputation;" from Anglo-French memorie (Old French memoire, 11c., "mind, memory, remembrance; memorial, record") and directly from Latin memoria "memory, remembrance, faculty of remembering," abstract noun from memor "mindful, remembering," from PIE root *(s)mer- (1) "to remember."

Sense of "commemoration" (of someone or something) is from c. 1300. Meaning "faculty of remembering; the mental capacity of retaining unconscious traces of conscious impressions or states, and of recalling these to consciousness in relation to the past," is late 14c. in English. Meaning "length of time included in the consciousness or observation of an individual" is from 1520s. 

I am grown old and my memory is not as active as it used to be. When I was younger I could remember anything, whether it had happened or not; but my faculties are decaying now and soon I shall be so I cannot remember any but the things that never happened. It is sad to go to pieces like this, but we all have to do it. ["Mark Twain," "Autobiography"]

Meaning "that which is remembered; anything fixed in or recalled to the mind" is by 1817, though the correctness of this use was disputed in 19c. The word was extended, with more or less of figurativeness, in 19c. to analogous physical processes. Computer sense, "device which stores information," is from 1946. Related: Memories.

updated on August 18, 2020

Definitions of memory from WordNet

memory (n.)
something that is remembered;
search as he would, the memory was lost
memory (n.)
the cognitive processes whereby past experience is remembered;
he can do it from memory
Synonyms: remembering
memory (n.)
the power of retaining and recalling past experience;
he had a good memory when he was younger
Synonyms: retention / retentiveness / retentivity
memory (n.)
an electronic memory device;
a memory and the CPU form the central part of a computer to which peripherals are attached
Synonyms: computer memory / storage / computer storage / store / memory board
memory (n.)
the area of cognitive psychology that studies memory processes;
he taught a graduate course on learning and memory
From, not affiliated with etymonline.