IPA: /kəˈmjuːteɪʃən/
KK: /kəˈmjuːteɪʃən/
A process of exchanging or substituting one thing for another, often used in legal or electrical contexts.
The judge granted a commutation of the sentence, reducing the prison time for the offender.
Commutation is formed from "com-" (meaning together) and "mutare" (meaning to change). The word refers to the act of changing or exchanging something, often used in the context of changing one form of payment or service for another.
Think of 'together' ('com-') and 'changing' ('mutare') something — that's why commutation means the act of changing or exchanging.