WordNet (r) 3.0 (2006):

turnaround
    n 1: time need to prepare a vessel or ship for a return trip
         [syn: turnaround, turnaround time]
    2: a decision to reverse an earlier decision [syn: reversal,
       change of mind, flip-flop, turnabout, turnaround]
    3: an area sufficiently large for a vehicle to turn around
    4: act or process of unloading and loading and servicing a
       vessel or aircraft for a return trip [syn: turnaround,
       turnround]
    5: turning in the opposite direction [syn: reversion,
       reverse, reversal, turnabout, turnaround]