We found one dictionary that defines the word subtractivity:

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1. subtractivity: Wiktionary

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