electroencephalography Syllabification: (e·lec·tro·en·ceph·a·log·ra·phy)Pronunciation: /iˌlektrōənˌsefəˈlägrəfē/Definition of electroencephalography noun the measurement of electrical activity in different parts of the brain and the recording of such activity as a visual trace (on paper or on an oscilloscope screen). electroencephalography in other Oxford dictionaries Definition of electroencephalography in the British & World English dictionary