The Collaborative International Dictionary of English v.0.48:

Inclined \In*clined"\, p. p. & a.
   1. Having a leaning or tendency towards, or away from, a
      thing; disposed or moved by wish, desire, or judgment; as,
      a man inclined to virtue. "Each pensively inclined."
      --Cowper.
      [1913 Webster]

   2. (Math.) Making an angle with some line or plane; -- said
      of a line or plane.
      [1913 Webster]

   3. (Bot.) Bent out of a perpendicular position, or into a
      curve with the convex side uppermost.
      [1913 Webster]

   Inclined plane. (Mech.)
      (a) A plane that makes an oblique angle with the plane of
          the horizon; a sloping plane. When used to produce
          pressure, or as a means of moving bodies, it is one of
          the mechanical powers, so called.
      (b) (Railroad & Canal) An inclined portion of track, on
          which trains or boats are raised or lowered from one
          level to another.
          [1913 Webster]

WordNet (r) 3.0 (2006):

inclined plane
    n 1: a simple machine for elevating objects; consists of plane
         surface that makes an acute angle with the horizontal