What is the meaning of the word "alter"?

Definitions:

to become different in some particular way, without permanently losing one's or its former characteristics or essence verb
- I altered my clothing style through the years.
to cause to change verb
- I altered the secret code.
to insert words into texts, often falsifying it thereby verb
- The spy secretly altered the records to hide their actions.
to make an alteration to verb
- I alter clothes for a living.
to remove the ovaries of verb
- The veterinarian altered the cat.