incommutability

/ˌɪnkəˌmjutəˈbɪləti/
noun
  1. The quality of being unchangeable or not able to be exchanged or substituted.
    • The incommutability of the ancient artifact made it priceless to collectors.
    • The incommutability of the contract meant no changes could be made after signing.
    • Philosophers debate the incommutability of certain moral principles.
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