What is the meaning of bettering?

verb

• Surpass in excellence.
  • usage: "She bettered her own record"; "break a record"
  • synonyms: better, break
• To make better.
  • usage: "The editor improved the manuscript with his changes"
  • synonyms: better, improve, amend, ameliorate, meliorate
• Get better.
  • usage: "The weather improved toward evening"
  • synonyms: better, improve, ameliorate, meliorate

adjective

• Changing for the better. .