[1] : The Collaborative International Dictionary of English v.0.48

soon \soon\, a.
   speedy; quick. obs. --shak.
   1913 webster

[2] : The Collaborative International Dictionary of English v.0.48

soon \soon\ s=oon, adv. oe. sone, as. s=ona; cf. ofries.
   s=on, os. s=ana, s=ano, ohg. s=ar, goth. suns.
   1. in a short time; shortly after any time specified or
      supposed; as, soon after sunrise. "sooner said than done."
      --old proverb. "as soon as it might be." --chaucer.
      1913 webster

            she finished, and the subtle fiend his lore
            soon learned.                         --milton.
      1913 webster

   2. without the usual delay; before any time supposed; early.
      1913 webster

            how is it that ye are come so soon to-day? --ex. ii.
                                                  18.
      1913 webster

   3. promptly; quickly; easily.
      1913 webster

            small lights are soon blown out, huge fires abide.
                                                  --shak.
      1913 webster

   4. readily; willingly; -- in this sense used with would, or
      some other word expressing will.
      1913 webster

            i would as soon see a river winding through woods or
            in meadows, as when it is tossed up in so many
            whimsical figures at versailles.      --addison.
      1913 webster

   as soon as, or so soon as, immediately at or after
      another event. "as soon as he came nigh unto the camp . .
      . he saw the calf, and the dancing." --ex. xxxii. 19. see
      so . . . as, under so.

   soon at, as soon as; or, as soon as the time referred to
      arrives. obs. "i shall be sent for soon at night."
      --shak.

   sooner or later, at some uncertain time in the future; as,
      he will discover his mistake sooner or later.

   with the soonest, as soon as any; among the earliest; too
      soon. obs. --holland.
      1913 webster
see also:
as soon as so soon as so . . . as so soon at sooner or later 
with the soonest 

[3] : WordNet (r) 2.0

soon
     adv : in the near future; "the doctor will soon be here"; "the
           book will appear shortly"; "she will arrive presently";
           "we should have news before long" syn: shortly, presently,
            before long
see also:
shortly presently before long 

[4] : Moby Thesaurus II by Grady Ward, 1.0

70 moby thesaurus words for "soon":
   after a time, after a while, afterward, afterwards, anon,
   at bottom, at once, before long, betimes, by and by, by destiny,
   directly, ere long, eventually, expeditiously, fatally, forthwith,
   gladly, happily, hastily, hopefully, immediately, imminently,
   in a jiffy, in a moment, in a second, in a while, in a wink,
   in aftertime, in due course, in due time, in good time,
   in short order, in the future, in time, instantly, later,
   lickety-split, lief, momentarily, on the double, one day, oversoon,
   posthaste, predictably, premature, presently, previous, probably,
   promptly, pronto, proximo, quick, quickly, rapidly, readily,
   right away, seasonably, shortly, sooner or later, speedily,
   straightway, swiftly, timely, tomorrow, tout de suite, ultimately,
   untimely, willingly, without delay

Soon >> S Words
Soon, definition of term: Soon
soon_pag1.html

Real Soon Now >> R Words
Real Soon Now, definition of term: Real Soon Now
real+soon+now_pag1.html

As Soon As >> A Words
As Soon As, definition of term: As Soon As
as+soon+as_pag1.html