We found one dictionary that defines the word assistiveness:

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1. assistiveness: Wiktionary

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