com ‧ mu ‧ ta ‧ tion /ˌkɒmjəˈteɪʃ ə n, ˌkɒmjʊˈteɪʃ ə n $ ˌkɑː-/ BrE AmE noun
[uncountable and countable] law a reduction in how severe a punishment is:
Activists campaigned for a commutation of Lee’s sentence.
com ‧ mu ‧ ta ‧ tion /ˌkɒmjəˈteɪʃ ə n, ˌkɒmjʊˈteɪʃ ə n $ ˌkɑː-/ BrE AmE noun
[uncountable and countable] law a reduction in how severe a punishment is:
Activists campaigned for a commutation of Lee’s sentence.
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012