A person who mends something; a repairer or improver (of).

A person who raises something or someone, in various senses; spec. a person who breeds animals or cultivates plants.

A person who or thing which makes something better; an improver.

A person who brings something or (occasionally) someone into a more valuable, desirable, or serviceable state or condition; a person who advances…

A person who or thing which improves something.

A person who or thing which improves or alleviates something. Cf. ameliorant, n.