Oxford Dictionary English life sentence nounnoun BrE BrE//ˈlaɪf sentəns// ; NAmE NAmE//ˈlaɪf sentəns// Types of punishment Add to my wordlistjump to other resultsthe punishment by which somebody spends the rest of their life in prison He’s currently serving a life sentence for murder. See related entries: Types of punishmentSee life sentence in the Oxford Advanced American DictionaryCheck pronunciation: life sentence oxfordlearnersdictionaries.com