Longman Dictionary of Contemporary English homepage

Date: 1200-1300
Origin: From an unrecorded Old English stælth 'stealing'

stealth

 noun
     
stealth [uncountable]
1 when you do something very quietly, slowly, or secretly, so that no one notices you:
Cats rely on stealth to catch their prey.
2 also Stealth a system of making military aircraft that cannot be discovered by radar instruments
stealth bomber/aircraft/fighter etc (=a plane made using this system)
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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