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The Collaborative International Dictionary
Improvingly

Improving \Im*prov"ing\, a. Tending to improve, beneficial; growing better. -- Im*prov"ing*ly, adv.

Improving lease (Scots Law), an extended lease to induce the tenant to make improvements on the premises.

Wiktionary
improvingly

adv. In a manner that tends to improve (especially, (context dated English), to educate or morally better a person).