The Collaborative International Dictionary of English v.0.48:

Turn \Turn\ (t[^u]rn), n.
   1. The act of turning; movement or motion about, or as if
      about, a center or axis; revolution; as, the turn of a
      wheel.
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   2. Change of direction, course, or tendency; different order,
      position, or aspect of affairs; alteration; vicissitude;
      as, the turn of the tide.
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            At length his complaint took a favorable turn.
                                                  --Macaulay.
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            The turns and varieties of all passions. --Hooker.
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            Too well the turns of mortal chance I know. --Pope.
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   3. One of the successive portions of a course, or of a series
      of occurrences, reckoning from change to change; hence, a
      winding; a bend; a meander.
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            And all its [the river's] thousand turns disclose.
            Some fresher beauty varying round.    --Byron.
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   4. A circuitous walk, or a walk to and fro, ending where it
      began; a short walk; a stroll.
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            Come, you and I must walk a turn together. --Shak.
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            I will take a turn in your garden.    --Dryden.
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   5. Successive course; opportunity enjoyed by alternation with
      another or with others, or in due order; due chance;
      alternate or incidental occasion; appropriate time.
      "Nobleness and bounty . . . had their turns in his [the
      king's] nature."
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            His turn will come to laugh at you again. --Denham.
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            Every one has a fair turn to be as great as he
            pleases.                              --Collier.
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   6. Incidental or opportune deed or office; occasional act of
      kindness or malice; as, to do one an ill turn.
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            Had I not done a friendes turn to thee? --Chaucer.
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            thanks are half lost when good turns are delayed.
                                                  --Fairfax.
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   7. Convenience; occasion; purpose; exigence; as, this will
      not serve his turn.
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            I have enough to serve mine own turn. --Shak.
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   8. Form; cast; shape; manner; fashion; -- used in a literal
      or figurative sense; hence, form of expression; mode of
      signifying; as, the turn of thought; a man of a sprightly
      turn in conversation.
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            The turn of both his expressions and thoughts is
            unharmonious.                         --Dryden.
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            The Roman poets, in their description of a beautiful
            man, often mention the turn of his neck and arms.
                                                  --Addison.
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   9. A change of condition; especially, a sudden or recurring
      symptom of illness, as a nervous shock, or fainting spell;
      as, a bad turn. [Colloq.]
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   10. A fall off the ladder at the gallows; a hanging; -- so
       called from the practice of causing the criminal to stand
       on a ladder which was turned over, so throwing him off,
       when the signal was given. [Obs.]
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   11. A round of a rope or cord in order to secure it, as about
       a pin or a cleat.
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   12. (Mining) A pit sunk in some part of a drift.
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   13. (Eng. Law) A court of record, held by the sheriff twice a
       year in every hundred within his county. --Blount.
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   14. pl. (Med.) Monthly courses; menses. [Colloq.]
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   15. (Mus.) An embellishment or grace (marked thus, ?),
       commonly consisting of the principal note, or that on
       which the turn is made, with the note above, and the
       semitone below, the note above being sounded first, the
       principal note next, and the semitone below last, the
       three being performed quickly, as a triplet preceding the
       marked note. The turn may be inverted so as to begin with
       the lower note, in which case the sign is either placed
       on end thus ?, or drawn thus ?.
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   By turns.
       (a) One after another; alternately; in succession.
       (b) At intervals. "[They] feel by turns the bitter
           change." --Milton.

   In turn, in due order of succession.

   To a turn, exactly; perfectly; as, done to a turn; -- a
      phrase alluding to the practice of cooking on a revolving
      spit.

   To take turns, to alternate; to succeed one another in due
      order.

   Turn and turn about, by equal alternating periods of
      service or duty; by turns.

   Turn bench, a simple portable lathe, used on a bench by
      clock makers and watchmakers.

   Turn buckle. See Turnbuckle, in Vocabulary.

   Turn cap, a sort of chimney cap which turns round with the
      wind so as to present its opening to the leeward. --G.
      Francis.

   Turn of life (Med.), change of life. See under Change.

   Turn screw, a screw driver.
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WordNet (r) 3.0 (2006):

in turn
    adv 1: in proper order or sequence; "talked to each child in
           turn"; "the stable became in turn a chapel and then a
           movie theater" [syn: successively, in turn]

Moby Thesaurus II by Grady Ward, 1.0:

41 Moby Thesaurus words for "in turn":
   alternately, au pair, by stages, by turns, consecutively, even,
   every other, exchangeably, hand running, hierarchically,
   in Indian file, in a chain, in a line, in a row, in a series,
   in column, in exchange, in file, in order, in return, in rotation,
   in sequence, in series, in single file, in succession, in turns,
   make and break, mutually, off and on, progressively, reciprocally,
   round and round, running, sequentially, serially, seriatim,
   step by step, successively, to and fro, turn about, up and down