The Collaborative International Dictionary of English v.0.48:

Hit \Hit\, v. t. [imp. & p. p. Hit; p. pr. & vb. n.
   Hitting.] [OE. hitten, hutten, of Scand. origin; cf. Dan.
   hitte to hit, find, Sw. & Icel. hitta.]
   1. To reach with a stroke or blow; to strike or touch,
      usually with force; especially, to reach or touch (an
      object aimed at).
      [1913 Webster]

            I think you have hit the mark.        --Shak.
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   2. To reach or attain exactly; to meet according to the
      occasion; to perform successfully; to attain to; to accord
      with; to be conformable to; to suit.
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            Birds learning tunes, and their endeavors to hit the
            notes right.                          --Locke.
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            There you hit him; . . . that argument never fails
            with him.                             --Dryden.
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            Whose saintly visage is too bright
            To hit the sense of human sight.      --Milton.
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            He scarcely hit my humor.             --Tennyson.
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   3. To guess; to light upon or discover. "Thou hast hit it."
      --Shak.
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   4. (Backgammon) To take up, or replace by a piece belonging
      to the opposing player; -- said of a single unprotected
      piece on a point.
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   To hit off, to describe with quick characteristic strokes;
      as, to hit off a speaker. --Sir W. Temple.

   To hit out, to perform by good luck. [Obs.] --Spenser.
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The Collaborative International Dictionary of English v.0.48:

hitting \hitting\ n. [vb. n. from hit, v.]
   The act of striking one thing against another; as, repeated
   hitting raised a large bruise

   Syn: hit, striking.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

hitting
    n 1: the act of contacting one thing with another; "repeated
         hitting raised a large bruise"; "after three misses she
         finally got a hit" [syn: hit, hitting, striking]