memory

memory /ˈmɛməri/ noun
plural memories
memory
/ˈmɛməri/
noun
plural memories
Britannica Dictionary definition of MEMORY
1 
: the power or process of remembering what has been learned
[count]
[noncount]
— see also photographic memory
2 
a  [count] : something that is remembered
b  [noncount] : the things learned and kept in the mind
3 
[count] : the things that are remembered about a person who has died
4 
: the period of time that a person can remember
[count]
— usually singular
[noncount]
5 
[noncount] computers
a  : capacity for storing information
b  : the part of a computer in which information is stored — see also random-access memory

from memory

: without reading or looking at notes

in memory of

or in someone's memory
: made or done to honor someone who has died

memory lane

◊ If you take a stroll/trip/walk (etc.) down memory lane, you think or talk about pleasant things from the past.