collaborator Syllabification: (col·lab·o·ra·tor)Pronunciation: /kəˈlabəˌrātər/Translate collaborator | into French | into German | into Italian | into Spanish Definition of collaborator noun 1a person who works jointly on an activity or project; an associate:his collaborator on the book 2a person who cooperates traitorously with an enemy; a defector:he was a collaborator during the occupationcollaborator in other Oxford dictionaries Definition of collaborator in the British & World English dictionary