Noun
wane [pl. wanes]
falloff [pl. falloffs]
scantiness [pl. scantinesses] , {relations}
shrinkage [pl. shrinkages] , {relations}
slightness [pl. slightnesses] , {relations}
...
drop {ping}
damping {Elec. Eng.}
تضاؤل {هندسة كهربائية}