(of a meeting) to be attended by all participants at a conference or assembly, who otherwise meet in smaller groups

the House is expected to bring the legislative procedures bill to a plenary meeting

the bill will become a law if it passes the plenary session

the following speakers will present plenary addresses at the conference

unqualified; absolute

the disciplinary committee will have plenary powers

a meeting or session attended by all participants at a conference or assembly

working parties would report back to the plenary with recommendations