What is the meaning of altering?

noun

• The sterilization of an animal.
  • usage: "they took him to the vet for neutering"
  • synonyms: neutering, fixing

verb

• Cause to change; make different; cause a transformation.
  • usage: "The advent of the automobile may have altered the growth pattern of the city"; "The discussion has changed my thinking about the issue"
  • synonyms: change, alter, modify
• Become different in some particular way, without permanently losing one's or its former characteristics or essence.
  • usage: "her mood changes in accordance with the weather"; "The supermarket's selection of vegetables varies according to the season"
  • synonyms: change, alter, vary
• Make an alteration to.
  • usage: "This dress needs to be altered"
  • synonyms: alter
• Insert words into texts, often falsifying it thereby.
  • synonyms: interpolate, alter, falsify
• Remove the ovaries of.
  • usage: "Is your cat spayed"
  • synonyms: alter, neuter, spay, castrate