The Collaborative International Dictionary of English v.0.48:

Away \A*way"\, adv. [AS. aweg, anweg, onweg; on on + weg way.]
   1. From a place; hence.
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            The sound is going away.              --Shak.
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            Have me away, for I am sore wounded.  --2 Chron.
                                                  xxxv. 23.
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   2. Absent; gone; at a distance; as, the master is away from
      home.
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   3. Aside; off; in another direction.
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            The axis of rotation is inclined away from the sun.
                                                  --Lockyer.
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   4. From a state or condition of being; out of existence.
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            Be near me when I fade away.          --Tennyson.
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   5. By ellipsis of the verb, equivalent to an imperative: Go
      or come away; begone; take away.
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            And the Lord said . . . Away, get thee down. --Exod.
                                                  xix. 24.
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   6. On; in continuance; without intermission or delay; as,
      sing away. [Colloq.]
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   Note: It is much used in phrases signifying moving or going
         from; as, go away, run away, etc.; all signifying
         departure, or separation to a distance. Sometimes
         without the verb; as, whither away so fast ? "Love hath
         wings, and will away." --Waller. It serves to modify
         the sense of certain verbs by adding that of removal,
         loss, parting with, etc.; as, to throw away; to trifle
         away; to squander away, etc. Sometimes it has merely an
         intensive force; as, to blaze away.
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   Away with, bear, abide. [Obs. or Archaic] "The calling of
      assemblies, I can not away with." (--Isa. i. 13), i. e.,
      "I can not bear or endure [it]."

   Away with one, signifies, take him away. "Away with him,
      crucify him." --John xix. 15.

   To make away with.
      (a) To kill or destroy.
      (b) To carry off.
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WordNet (r) 3.0 (2006):

away
    adv 1: from a particular thing or place or position (`forth' is
           obsolete); "ran away from the lion"; "wanted to get away
           from there"; "sent the children away to boarding school";
           "the teacher waved the children away from the dead
           animal"; "went off to school"; "they drove off"; "go
           forth and preach" [syn: away, off, forth]
    2: from one's possession; "he gave out money to the poor"; "gave
       away the tickets" [syn: away, out]
    3: out of the way (especially away from one's thoughts); "brush
       the objections aside"; "pushed all doubts away" [syn:
       aside, away]
    4: out of existence; "the music faded away"; "tried to explain
       away the affair of the letter"- H.E.Scudder; "idled the hours
       away"; "her fingernails were worn away"
    5: at a distance in space or time; "the boat was 5 miles off (or
       away)"; "the party is still 2 weeks off (or away)"; "away
       back in the 18th century" [syn: off, away]
    6: indicating continuing action; continuously or steadily; "he
       worked away at the project for more than a year"; "the child
       kept hammering away as if his life depended on it"
    7: so as to be removed or gotten rid of; "cleared the mess
       away"; "the rotted wood had to be cut away"
    8: freely or at will; "fire away!"
    9: in or into a proper place (especially for storage or
       safekeeping); "put the toys away"; "her jewels are locked
       away in a safe"; "filed the letter away"
    10: in a different direction; "turn aside"; "turn away one's
        face"; "glanced away" [syn: away, aside]
    11: in reserve; not for immediate use; "started setting aside
        money to buy a car"; "put something by for her old age";
        "has a nest egg tucked away for a rainy day" [syn: aside,
        by, away]
    adj 1: not present; having left; "he's away right now"; "you
           must not allow a stranger into the house when your mother
           is away"
    2: used of an opponent's ground; "an away game" [ant: home(a)]
    3: (of a baseball pitch) on the far side of home plate from the
       batter; "the pitch was away (or wide)"; "an outside pitch"
       [syn: away, outside]

Moby Thesaurus II by Grady Ward, 1.0:

106 Moby Thesaurus words for "away":
   a rebours, a reculons, absconded, absent, afar, against the grain,
   aloof, anticlockwise, apart, arear, aside, ass-backwards, astern,
   asunder, at a distance, at once, back, backward, backwards,
   counterclockwise, deleted, departed, directly, disappeared, distal,
   distant, distantly, elsewhere, elsewhither, exotic, expeditiously,
   extinct, far, far off, faraway, forth, forthwith, fro, gone,
   gone away, hence, hindward, hindwards, immediately,
   in juxtaposition, in reverse, instanter, instantly, lacking,
   long-distance, long-range, lost, lost to sight, lost to view,
   missing, momentarily, nearby, no longer present, no more,
   nonattendant, nonexistent, not found, not here, not present, now,
   off, omitted, on one side, on the side, out, out of sight, over,
   past and gone, promptly, pronto, punctually, quickly, rearward,
   rearwards, remote, remotely, removed, retrad, right, right away,
   right off, separated, sidelong, somewhere else, speedily, straight,
   straightway, subtracted, swiftly, taken away, thence, therefrom,
   thereof, to one side, to the side, vanished, wanting, whence,
   widdershins, wide apart, wide away