Wordnet 3.0
NOUN (1)
1. 
 truth or reality; 
- Example: "in sooth"
The Collaborative International Dictionary of English v.0.48:
Sooth \Sooth\, n. [AS. s[=o][eth]. See Sooth, a.]
   1. Truth; reality. [Archaic]
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            The sooth it this, the cut fell to the knight.
                                                  --Chaucer.
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            In sooth, I know not why I am so sad. --Shak.
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            In good sooth,
            Its mystery is love, its meaninng youth.
                                                  --Longfellow.
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   2. Augury; prognostication. [Obs.]
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            The soothe of birds by beating of their wings.
                                                  --Spenser.
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   3. Blandishment; cajolery. [Obs.] --Shak.
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The Collaborative International Dictionary of English v.0.48:
Sooth \Sooth\ (s[=oo]th), a.; also adv. [Compar. Soother
   (s[=oo]th"[~e]r); superl. Soothest.] [OE. soth, AS.
   s[=o][eth], for san[eth]; akin to OS. s[=o][eth], OHG. sand,
   Icel. sannr, Sw. sann, Dan. sand, Skr. sat, sant, real,
   genuine, present, being; properly p. pr. from a root meaning,
   to be, Skr. as, L. esse; also akin to Goth. sunjis true, Gr.
   'eteo`s, Skr. satya. [root]9. Cf. Absent, Am, Essence,
   Is, Soothe, Sutee.]
   1. True; faithful; trustworthy. [Obs. or Scot.]
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            The sentence [meaning] of it sooth is, out of doubt.
                                                  --Chaucer.
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            That shall I sooth (said he) to you declare.
                                                  --Spensser.
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   2. Pleasing; delightful; sweet. [R.]
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            The soothest shepherd that ever piped on plains.
                                                  --Milton.
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            With jellies soother than the creamy curd. --Keats.
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WordNet (r) 3.0 (2006):
sooth
    n 1: truth or reality; "in sooth"