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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.
[Middle English memorie, from Anglo-French, from Latin memoria, from memor, mindful; see (s)mer-1 in the Appendix of Indo-European roots.]
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.