reformer
definitions
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noun
a person who seeks to improve or change something, especially a social systemfr: réformateur
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noun
a person who makes changes to a machine or system to make it work betterfr: améliorateur
examples
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He was a social reformer.
Il était un réformateur social.
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The engineer was a tireless reformer.
L'ingénieur était un améliorateur infatigable.