Noun
The ability of a weapon (typically a firearm or other ranged weapon) to rapidly incapacitate or immobilize a target.
Troops in the Philippines preferred the .45 over the .38 because of its greater stopping power against charging tribesmen.
(advertising) A research measure that captures a print advertisement's ability to grab the attention of the reader; also known as the attention rating.
The Victoria's Secret ad's racy image generated strong stopping power ratings.
(particle physics) The retarding force exerted on a high-energy particle by interactions with the medium through which it passes.
Source: en.wiktionary.org