debrief /diːˈbɹiːf/verb 3noun 1forms 3 verb3 •To question someone after a military mission in order to obtain information (especially intelligence). •To question someone, or a group of people, after the implementation of a project, in order to learn from mistakes, etc. •To inform subjects of an experiment about what has happened in a complete and accurate manner. noun1 •Synonym of debriefingWe had a debrief yesterday. formsdebriefed · debriefing · debriefs