verb (used with object)
to interrogate (a soldier, astronaut, diplomat, etc.) on return from a mission in order to assess the conduct and results of the mission.
to question formally and systematically in order to obtain useful intelligence or information: Political and economic experts routinely debrief important defectors about conditions in their home country.
to subject to prohibitions against revealing or discussing classified information, as upon separation from a position of military or political sensitivity.
Psychology. (after an experiment) to disclose to the subject the purpose of the experiment and any reasons for deception or manipulation.

1940–45; de- + brief

debriefer, noun
debriefing, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
debrief (diːˈbriːf)
Compare brief (of a soldier, astronaut, diplomat, etc) to make or (of his superiors) to elicit a report after a mission or event

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"obtain information (from someone) at the end of a mission," 1945, from de- + brief (v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
During the fight, there's an aside from each team member taken from a debriefing after the mission.
The elevated mood lasted all the way back to camp, until the evening debriefing.
Maybe he knew why the engine blew, but only after a debriefing with team engineers.
Debriefing sessions shall not be recorded in any manner, including in writing.
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