I had no clue what a plenary session was until I looked it up in Wikipedia while researching words to use in today’s puzzle:
A plenary session (with a plenary speech or plenary talk) is derived from the Latin root plenarius meaning “full” or “absolute”.
It usually refers to a session in a conference which is open to all (or a large number) of attendant speakers, who may each contribute prepared or ad-hoc material.
See! You learned something new today.
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