WordReference Random House Unabridged Dictionary of American English © 2026
in•com•mut•a•ble
(in′kə myo̅o̅′tə bəl),USA pronunciation adj.
in′com•mut′a•bil′i•ty, in′com•mut′a•ble•ness, n.
in′com•mut′a•bly, adv.
- not exchangeable.
- unchangeable;
unalterable.
- Latin incommūtābilis. See in-3, commutable
- late Middle English 1400–50
in′com•mut′a•bly, adv.