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improver

/ɪmˈpɹuːvɚ/ noun

noun Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about improver at Wordnik → Where our words come from →

  1. Something that, or someone who, improves something.
  2. Specifically, a person who improves land or property, a landscaper.
  3. One who improves his or her performance, one who shows improvement (of individuals or groups).

noun

  1. One who performs improv; an improviser.