The quality or state of being commutable; the ability to be exchanged, replaced, or reduced (especially in legal or mathematical contexts).
From commutable (from Latin commutare 'to change, exchange') + -ness (suffix for nouns describing quality). Combines with mathematical and legal terminology.
In mathematics, the 'commutableness' of addition (3+5 = 5+3) seems obvious to us, but it's so fundamental that mathematicians had to formally name and prove it—showing how language captures deep logical truths!
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