decommission

UK: /ˌdiːkəˈmɪʃ^ən/ US: /ˌdikəˈmɪʃən/ ,(dē′kə mish′ən)

WordReference Random House Learner's Dictionary of American English © 2026

de•com•mis•sion /ˌdikəˈmɪʃən/   v. [ ~ + obj]

1. to retire (a ship or airplane) from active service.

WordReference Random House Unabridged Dictionary of American English © 2026

de•com•mis•sion  (dē′kə mish′ən), v.t. 

1. to remove or retire (a ship, airplane, etc.) from active service.
2. to deactivate;
   shut down:
   to decommission a nuclear power plant.

• de- + commission 1925–30

Collins Concise English Dictionary © HarperCollins Publishers::

decommission / ˌdiːkəˈmɪʃən/ verb

1. (transitive) to dismantle or remove from service (a nuclear reactor, weapon, ship, etc which is no longer required)