"obtain information (from someone) at the end of a mission," 1945 (implied in verbal noun de-briefing), from de- + brief (v.). Related: Debriefed.

Where did the term debrief come from?

The word debrief emerged at the end of World War II, originally as a military term. Definitions of debrief. verb. put someone through a debriefing and make him report. “The released hostages were debriefed”

Who invented debriefing?

It was developed by Jeffrey Mitchell and is considered the most widely used today. It operates using the following three components: pre-incident functions, on-scene support services, and post-incident interventions.