angular acceleration UK /ˈæŋ.ɡjʊ.lə(ɹ)əkˌsɛl.əˈɹeɪ.ʃən/US /ˈæŋ.ɡju.lɚ(ɹ)əkˌsɛl.əˈɹeɪ.ʃən/ noun1 •The rate of change of angular velocity, often represented by α. formsangular accelerations