The Collaborative International Dictionary of English v.0.48:

Out \Out\ (out), n.
   1. One who, or that which, is out; especially, one who is out
      of office; -- generally in the plural.
      [1913 Webster]

   2. A place or space outside of something; a nook or corner;
      an angle projecting outward; an open space; -- chiefly
      used in the phrase ins and outs; as, the ins and outs of a
      question. See under In.
      [1913 Webster]

   3. (Print.) A word or words omitted by the compositor in
      setting up copy; an omission.
      [1913 Webster]

   To make an out (Print.),
      (a) to omit something, in setting or correcting type,
          which was in the copy.
      (b) (Baseball) to be put out in one's turn at bat, such as
          to strike out, to ground out, or to fly out.
          [1913 Webster]

WordNet (r) 3.0 (2006):

ground out
    v 1: make an out by hitting the ball on the ground