Entry 1 sense Webster, 1913 Potentiometer · Po·ten·ti·om·e·ter · IPA /pəˌtɛn(t)ʃiˈɑmɪtəɹ/ 01 n. An instrument for measuring or comparing electrial potentials or electro-motive forces. 1. An instrument for measuring or comparing electrial potentials or electro-motive forces.(Elec.)