Learn how to say Plenary correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word plenary:
crusaders were offered a plenary indulgence by the Pope
2(of a meeting) to be attended by all participants at a conference or assembly, who otherwise meet in smaller groups:
a plenary session of the European Parliament
a meeting or session attended by all participants at a conference or assembly:
working parties would report back to the plenary with recommendations
late Middle English: from late Latin plenarius ‘complete’, from plenus ‘full’