stealth /stelθ/ BrE AmE noun [uncountable]
[ Date: 1200-1300 ; Origin: From an unrecorded Old English stælth 'stealing' ]
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)