资料来源 : Webster's Revised Unabridged Dictionary (1913)

   2. (Com.) The voluntary and unnecessary departure of a ship
      from, or delay in, the regular and usual course of the
      specific voyage insured, thus releasing the underwriters
      from their responsibility.

   {Deviation of a falling body} (Physics), that deviation from
      a strictly vertical line of descent which occurs in a body
      falling freely, in consequence of the rotation of the
      earth.

   {Deviation of the compass}, the angle which the needle of a
      ship's compass makes with the magnetic meridian by reason
      of the magnetism of the iron parts of the ship.

   {Deviation of the line of the vertical}, the difference
      between the actual direction of a plumb line and the
      direction it would have if the earth were a perfect
      ellipsoid and homogeneous, -- caused by the attraction of
      a mountain, or irregularities in the earth's density.