operationalism Syllabification: (op·er·a·tion·al·ism)Pronunciation: /äpəˈrāSHənlˌizəm/Definition of operationalism noun (also operationism) Philosophy a form of positivism that defines scientific concepts in terms of the operations used to determine or prove them. Derivatives operationalist noun & adjective operationalism in other Oxford dictionaries Definition of operationalism in the British & World English dictionary