The Collaborative International Dictionary of English v.0.48:

Round \Round\, v. t. [imp. & p. p. Rounded; p. pr. & vb. n.
   Rounding.]
   1. To make circular, spherical, or cylindrical; to give a
      round or convex figure to; as, to round a silver coin; to
      round the edges of anything.
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            Worms with many feet, which round themselves into
            balls, are bred chiefly under logs of timber.
                                                  --Bacon.
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            The figures on our modern medals are raised and
            rounded to a very great perfection.   --Addison.
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   2. To surround; to encircle; to encompass.
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            The inclusive verge
            Of golden metal that must round my brow. --Shak.
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   3. To bring to fullness or completeness; to complete; hence,
      to bring to a fit conclusion.
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            We are such stuff
            As dreams are made on, and our little life
            Is rounded with a sleep.              --Shak.
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   4. To go round wholly or in part; to go about (a corner or
      point); as, to round a corner; to round Cape Horn.
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   5. To make full, smooth, and flowing; as, to round periods in
      writing. --Swift.
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   To round in (Naut.) To haul up; usually, to haul the slack
      of (a rope) through its leading block, or to haul up (a
      tackle which hangs loose) by its fall. --Totten.
      (b) To collect together (cattle) by riding around them, as
          on cattle ranches. [Western U.S.]
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The Collaborative International Dictionary of English v.0.48:

Rounding \Round"ing\, n.
   1. (Naut.) Small rope, or strands of rope, or spun yarn,
      wound round a rope to keep it from chafing; -- called also
      service.
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   2. (Phonetics) Modifying a speech sound by contraction of the
      lip opening; labializing; labialization. See Guide to
      Pronunciation, [sect] 11.
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The Collaborative International Dictionary of English v.0.48:

Rounding \Round"ing\, a.
   Round or nearly round; becoming round; roundish.
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WordNet (r) 3.0 (2006):

rounding
    n 1: (mathematics) a miscalculation that results from rounding
         off numbers to a convenient number of decimals; "the error
         in the calculation was attributable to rounding"; "taxes
         are rounded off to the nearest dollar but the rounding
         error is surprisingly small" [syn: rounding, rounding
         error]