stealth

[stelth]
noun
1.
secret, clandestine, or surreptitious procedure.
2.
a furtive departure or entrance.
3.
Obsolete.
a.
an act of stealing; theft.
b.
the thing stolen; booty.
4.
(initial capital letter) Military. a U.S. Air force project involving a range of technologies, with the purpose of developing aircraft that are difficult to detect by sight, sound, radar, and infrared energy.
adjective
5.
surreptitious; secret; not openly acknowledged: a stealth hiring of the competitor's CEO; the stealth issue of the presidential race.

Origin:
1200–50; Middle English stelthe; compare Old English stælthing theft. See steal, -th1

stealthful, adjective
stealthfully, adverb
stealthless, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
stealth (stɛlθ)
 
n
1.  the act or characteristic of moving with extreme care and quietness, esp so as to avoid detection: the stealth of a cat
2.  cunning or underhand procedure or dealing
3.  archaic the act of stealing
 
[C13 stelthe; see steal, -th1]
 
'stealthful
 
adj

Stealth (stɛlθ)
 
n
informal (modifier) denoting or referring to technology that aims to reduce the radar, thermal, and acoustic recognizability of aircraft and missiles

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

stealth
mid-13c., "theft, action or practice of stealing," from O.E. *stælþ, which is related to stelen (see steal), from P.Gmc. *stælitho (cf. O.N. stulþr). Sense of "secret action" developed c.1300, but the word also retained its etymological sense into 18c.
Got a boost as an adj. from stealth fighter, stealth bomber, radar-evading U.S. military aircraft, activated 1983.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Nonetheless, the ritual endures, an intimate reminder of the time before
  stealth applications.
Pursuing our interests and spreading our ideals thus requires stealth and
  modesty as well as military strength.
Thanksgiving dinner has turned out to be the stealth weapon of the writer's
  reporting life.
However, they afterwards watched an opportunity, and carried them off by
  stealth.
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