Etymology
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briefing (n.)

"fact or situation of giving preliminary instructions," 1910 (but popularized by World War II pre-flight conferences), verbal noun from brief (v.).

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brief (v.)

"to give instructions or information to," 1866; originally "to instruct by a brief" (1862), from brief (n.). Related: Briefed; briefing.

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debrief (v.)

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

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