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n. pl. mem·o·ries
1. The mental faculty of retaining and recalling past experience.
2. The act or an instance of remembering; recollection: spent the afternoon lost in memory.
3. All that a person can remember: It hasn't happened in my memory.
4. Something that is remembered: pleasant childhood memories.
5. The fact of being remembered; remembrance: dedicated to their parents' memory.
6. The period of time covered by the remembrance or recollection of a person or group of persons: within the memory of humankind.
a. A unit of a computer that preserves data for retrieval.
b. Capacity for storing information: two gigabytes of memory.
8. Statistics The set of past events affecting a given event in a stochastic process.
9. The capacity of a material, such as plastic or metal, to return to a previous shape after deformation.
10. Immunology The ability of the immune system to respond faster and more powerfully to subsequent exposure to an antigen.
When someone writes their memoirs, they write a book about people and events that they remember.
He was busy writing his memoirs.
They're making a movie of his war memoirs.
You do not use 'memoirs' to refer to things that you remember about the past. The word you use is memories.
My memories of a London childhood are happy ones.
One of my earliest memories is of a total eclipse of the sun.