The Collaborative International Dictionary of English v.0.48:

Round \Round\, a. [OF. roond, roont, reond, F. rond, fr. L.
   rotundus, fr. rota wheel. See Rotary, and cf. Rotund,
   roundel, Rundlet.]
   1. Having every portion of the surface or of the
      circumference equally distant from the center; spherical;
      circular; having a form approaching a spherical or a
      circular shape; orbicular; globular; as, a round ball.
      "The big, round tears." --Shak.
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            Upon the firm opacous globe
            Of this round world.                  --Milton.
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   2. Having the form of a cylinder; cylindrical; as, the barrel
      of a musket is round.
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   3. Having a curved outline or form; especially, one like the
      arc of a circle or an ellipse, or a portion of the surface
      of a sphere; rotund; bulging; protuberant; not angular or
      pointed; as, a round arch; round hills. "Their round
      haunches gored." --Shak.
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   4. Full; complete; not broken; not fractional; approximately
      in even units, tens, hundreds, thousands, etc.; -- said of
      numbers.
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            Pliny put a round number near the truth, rather than
            the fraction.                         --Arbuthnot.
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   5. Not inconsiderable; large; hence, generous; free; as, a
      round price.
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            Three thousand ducats; 'tis a good round sum.
                                                  --Shak.
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            Round was their pace at first, but slackened soon.
                                                  --Tennyson.
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   6. Uttered or emitted with a full tone; as, a round voice; a
      round note.
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   7. (Phonetics) Modified, as a vowel, by contraction of the
      lip opening, making the opening more or less round in
      shape; rounded; labialized; labial. See Guide to
      Pronunciation, [sect] 11.
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   8. Outspoken; plain and direct; unreserved; unqualified; not
      mincing; as, a round answer; a round oath. "The round
      assertion." --M. Arnold.
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            Sir Toby, I must be round with you.   --Shak.
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   9. Full and smoothly expanded; not defective or abrupt;
      finished; polished; -- said of style, or of authors with
      reference to their style. [Obs.]
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            In his satires Horace is quick, round, and pleasant.
                                                  --Peacham.
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   10. Complete and consistent; fair; just; -- applied to
       conduct.
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             Round dealing is the honor of man's nature.
                                                  --Bacon.
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   At a round rate, rapidly. --Dryden.

   In round numbers, approximately in even units, tens,
      hundreds, etc.; as, a bin holding 99 or 101 bushels may be
      said to hold in round numbers 100 bushels.

   Round bodies (Geom.), the sphere right cone, and right
      cylinder.

   Round clam (Zool.), the quahog.

   Round dance one which is danced by couples with a whirling
      or revolving motion, as the waltz, polka, etc.

   Round game, a game, as of cards, in which each plays on his
      own account.

   Round hand, a style of penmanship in which the letters are
      formed in nearly an upright position, and each separately
      distinct; -- distinguished from running hand.

   Round robin. [Perhaps F. round round + ruban ribbon.]
       (a) A written petition, memorial, remonstrance, protest,
           etc., the signatures to which are made in a circle so
           as not to indicate who signed first. "No round robins
           signed by the whole main deck of the Academy or the
           Porch." --De Quincey.
       (b) (Zool.) The cigar fish.

   Round shot, a solid spherical projectile for ordnance.

   Round Table, the table about which sat King Arthur and his
      knights. See Knights of the Round Table, under Knight.


   Round tower, one of certain lofty circular stone towers,
      tapering from the base upward, and usually having a
      conical cap or roof, which crowns the summit, -- found
      chiefly in Ireland. They are of great antiquity, and vary
      in heigh from thirty-five to one hundred and thiry feet.


   Round trot, one in which the horse throws out his feet
      roundly; a full, brisk, quick trot. --Addison.

   Round turn (Naut.), one turn of a rope round a timber, a
      belaying pin, etc.

   To bring up with a round turn, to stop abruptly. [Colloq.]
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   Syn: Circular; spherical; globular; globase; orbicular;
        orbed; cylindrical; full; plump; rotund.
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WordNet (r) 3.0 (2006):

round dance
    n 1: a folk dance; dancers form a circle [syn: round dance,
         ring dance]
    2: a ballroom dance characterized by revolving movement [syn:
       round dance, round dancing]