Etymology

peacekeeping

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Today it means: The act of preserving peace, specifically between hostile groups or states, especially by a sanctioned military force. Full definition →

First used 17th c.
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The story

From peace + keeping, after keep the peace.

First known use, by meaning

  • from 17th c. The act of preserving peace, specifically between hostile groups or states, especially by a sanctioned military force.

Etymology from Wiktionary, CC BY-SA 4.0.