driftage

from WordNet (r) 3.0 (2006)
driftage
    n 1: the deviation (by a vessel or aircraft) from its intended
         course due to drifting
from The Collaborative International Dictionary of English v.0.48
Driftage \Drift"age\, n.
   1. Deviation from a ship's course due to leeway.
      [1913 Webster]

   2. Anything that drifts.
      [1913 Webster]
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