manual reversion UK /ˈman.j(ʊ).əl ɹɪˈvəː.ʃən/US /ˈmæn.j(əw).əl ɹɪˈvɚ.ʒən/ noun1 •The actuation via purely mechanical means (using cables and/or pushrods) of one or more control surfaces that are usually controlled by hydraulics.