noun. ['ˌækˌsɛlɝˈeɪʃən'] the act of accelerating; increasing the speed.
noun. ['ˌækˌsɛlɝˈeɪʃən'] an increase in rate of change.
noun. ['ˌækˌsɛlɝˈeɪʃən'] (physics) a rate of increase of velocity.