The Collaborative International Dictionary of English v.0.48:

Over \O"ver\, adv.
   1. From one side to another; from side to side; across;
      crosswise; as, a board, or a tree, a foot over, i. e., a
      foot in diameter.
      [1913 Webster]

   2. From one person or place to another regarded as on the
      opposite side of a space or barrier; -- used with verbs of
      motion; as, to sail over to England; to hand over the
      money; to go over to the enemy. "We will pass over to
      Gibeah." --Judges xix. 12. Also, with verbs of being: At,
      or on, the opposite side; as, the boat is over.
      [1913 Webster]

   3. From beginning to end; throughout the course, extent, or
      expanse of anything; as, to look over accounts, or a stock
      of goods; a dress covered over with jewels.
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   4. From inside to outside, above or across the brim.
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            Good measure, pressed down . . . and running over.
                                                  --Luke vi. 38.
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   5. Beyond a limit; hence, in excessive degree or quantity;
      superfluously; with repetition; as, to do the whole work
      over. "So over violent." --Dryden.
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            He that gathered much had nothing over. --Ex. xvi.
                                                  18.
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   6. In a manner to bring the under side to or towards the top;
      as, to turn (one's self) over; to roll a stone over; to
      turn over the leaves; to tip over a cart.
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   7. Completed; at an end; beyond the limit of continuance;
      finished; as, when will the play be over?. "Their distress
      was over." --Macaulay. "The feast was over." --Sir W.
      Scott.
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   Note: Over, out, off, and similar adverbs, are often used in
         the predicate with the sense and force of adjectives,
         agreeing in this respect with the adverbs of place,
         here, there, everywhere, nowhere; as, the games were
         over; the play is over; the master was out; his hat is
         off.
         [1913 Webster]

   Note: Over is much used in composition, with the same
         significations that it has as a separate word; as in
         overcast, overflow, to cast or flow so as to spread
         over or cover; overhang, to hang above; overturn, to
         turn so as to bring the underside towards the top;
         overact, overreach, to act or reach beyond, implying
         excess or superiority.
         [1913 Webster]

   All over.
      (a) Over the whole; upon all parts; completely; as, he is
          spatterd with mud all over.
      (b) Wholly over; at an end; as, it is all over with him.


   Over again, once more; with repetition; afresh; anew.
      --Dryden.

   Over against, opposite; in front. --Addison.

   Over and above, in a manner, or degree, beyond what is
      supposed, defined, or usual; besides; in addition; as, not
      over and above well. "He . . . gained, over and above, the
      good will of all people." --L' Estrange.

   Over and over, repeatedly; again and again.

   To boil over. See under Boil, v. i.

   To come it over, To do over, To give over, etc. See
      under Come, Do, Give, etc.

   To throw over, to abandon; to betray. Cf. To throw
      overboard, under Overboard.
      [1913 Webster]

WordNet (r) 3.0 (2006):

over and over
    adv 1: repeatedly; "the unknown word turned up over and over
           again in the text" [syn: over and over, again and
           again, over and over again, time and again, time
           and time again]

Moby Thesaurus II by Grady Ward, 1.0:

19 Moby Thesaurus words for "over and over":
   again and again, day after day, day by day, frequently,
   many a time, many times, many times over, much, oft, often,
   oftentimes, ofttimes, recurrently, repeatedly, several times,
   time after time, time and again, times without number,
   year after year