The Collaborative International Dictionary of English v.0.48:

Stealth \Stealth\ (st[e^]lth), n. [OE. stal[thorn]e. See
   Steal, v. t.]
   1. The act of stealing; theft. [Obs.]
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            The owner proveth the stealth to have been committed
            upon him by such an outlaw.           --Spenser.
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   2. The thing stolen; stolen property. [Obs.] "Sluttish dens .
      . . serving to cover stealths." --Sir W. Raleigh.
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   3. The bringing to pass anything in a secret or concealed
      manner; a secret procedure; a clandestine practice or
      action; -- in either a good or a bad sense.
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            Do good by stealth, and blush to find it fame.
                                                  --Pope.
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            The monarch, blinded with desire of wealth,
            With steel invades the brother's life by stealth.
                                                  --Dryden.
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            I told him of your stealth unto this wood. --Shak.
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WordNet (r) 3.0 (2006):

stealth
    n 1: avoiding detection by moving carefully [syn: stealth,
         stealing]