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unexchangeable

adjective
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un·​exchangeable | \ ¦ən+ \

Definition of unexchangeable

: not capable of being substituted one for another : incommutable

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“Unexchangeable.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/unexchangeable. Accessed 19 January 2020.

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