Definition of "peacekeeping"

peacekeeping

/ˈpiːskiːpɪŋ/

noun
usually uncountable, plural peacekeepings
1. The act of preserving peace, specifically between hostile groups or states, especially by a sanctioned military force.
  Quotations
  Peacekeeping is one of the things that the United Nations, for all its foibles, does well.
  2011, Steven Pinker, The Better Angels of Our Nature, Penguin, published 2012, page 378
2. (as a noun modifier) (for example) a peacekeeping force.