We found one dictionary that defines the word meliorability:

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1. meliorability: Wiktionary

Definitions from Wiktionary (meliorability) ▸ noun:  The ability to be improved. ▸ Words similar to meliorability ▸ Usage examples for meliorability ▸ Idioms related to meliorability ▸ Wikipedia articles (New!) ▸ Popular adjectives describing meliorability ▸ Words that often appear near meliorability ▸ Rhymes of meliorability ▸ Invented words related to meliorability