1. ADJ A plenary session or plenary meeting is one that is attended by everyone who has the right to attend. 全體出席的[技術(shù)] [ADJ n]

...a plenary session of the Central Committee. …一次中央委員會(huì)全會(huì)。

2. N-COUNT Plenary is also a noun. 全體會(huì)議

There'll be another plenary at the end of the afternoon after the workshop. 傍晚專(zhuān)題討論會(huì)后將另有一個(gè)全體會(huì)議。