Plain English Meaning
A sit-down talk after the flight where the instructor and student go over what happened, what went well, what didn't, and what to work on next.
Full Definition
A structured review conducted by an instructor with a student after a training flight, in which the flight is analyzed, performance is critiqued, errors and successes are identified, and points are reinforced for the next lesson.
Context Anchor
You will encounter a flight debriefing after a training flight, stage check, simulator session, or any lesson where performance needs to be reviewed while the details are still fresh.
Derivation
From 'de-' (reverse or undo) plus 'brief' (a short instruction or summary). A 'briefing' is given before an event; a 'debriefing' is the review afterward. The word entered general use through military aviation, where pilots were debriefed on what occurred during a mission.
Why Pilots Care
Converts experience into retained skill and prevents small errors from becoming repeated habits.