stereoelectronic UK /ˌstɛɹ.i.əʊ.ɪ.lɛkˈtɹɒn.ɪk/US /ˌstɛɹ.i.oʊ.ɪ.lɛkˈtɹɑn.ɪk/ adjective1 •Of or pertaining to the dependence of certain molecular properties upon the relative nuclear geometry in a given electron state.