"bettering" in the verb sense
1. better, break
surpass in excellence
"She bettered her own record"
"break a record"
2. better, improve, amend, ameliorate, meliorate
to make better
"The editor improved the manuscript with his changes"
3. better, improve, ameliorate, meliorate
get better
"The weather improved toward evening"
"bettering" in the adjective sense
1. bettering
changing for the better
Source: WordNet® (An amazing lexical database of English)
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