n 1 o 1 n 1 p 3 r 1 o 1 l 1 i 1 f 4 e 1 r 1 a 1 t 1 i 1 o 1 n 1 s 1
17 letters · 22 points in Scrabble
Meaning
noun the prevention of something increasing or spreading (especially the prevention of an increase in the number of countries possessing nuclear weapons)