lockout Syllabification: (lock·out)Pronunciation: /ˈläkˌout/Translate lockout | into German | into Italian | into Spanish Definition of lockout noun 1the exclusion of employees by their employer from their place of work until certain terms are agreed to. 2a device used to ensure that machines remain inoperable while repairs or adjustments are made. lockout in other Oxford dictionaries Definition of lockout in the British & World English dictionary