1
a plenary [noun]
plenary 作定语表示“全体出席的”，常与 session、meeting 等可数名词搭配；单数可数名词前要加 a/an。
They held a plenary session to discuss the new policy.
他们举行了一次全体会议来讨论新政策。
全体与会的；供全体参加的
先理解核心含义，再看它在真实句子里的用法。
全体与会的；供全体参加的
attended by all participants; open to all
They held a plenary session to discuss the new policy.
他们举行了一次全体会议来讨论新政策。
全体出席的；供全体参加的
Fully attended by a plenum; for everyone's attendance.
完全的；全部的；绝对的
Complete; full; entire; absolute.
The plenary session begins at nine, so please be seated in the main hall.
全体会议九点开始，请在主厅就座。
After two days of small-group talks, the conference ended with a plenary discussion.
经过两天的小组讨论后，会议以全体讨论结束。
Only the plenary assembly has the authority to vote on the new rules.
只有全体大会有权对新规则进行表决。
plenary 作定语表示“全体出席的”，常与 session、meeting 等可数名词搭配；单数可数名词前要加 a/an。
They held a plenary session to discuss the new policy.
他们举行了一次全体会议来讨论新政策。
plenary 也可表示“完全的、绝对的”，常修饰 power、authority 等不可数抽象名词，前面不用冠词。
The committee was given plenary authority to approve the budget.
委员会被授予批准预算的完全权力。
Not this
The conference was plenary attended by all delegates.
Use this
The conference was fully attended by all delegates.
plenary 是形容词，不能用来修饰动词 attended；应改用副词 fully，意为“完全地、全体地”。
Not this
The proposal needs plenary support from the committee.
Use this
The proposal needs full support from the committee.
plenary 通常修饰 session、meeting 等表示“全体出席的”，或用于 plenary power 这类固定搭配；指“完全的、全部的支持”时，现代英语更自然的说法是 full support，而不是 plenary support。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
全体会议；全会
The plenary session will be held in the main hall tomorrow morning.
明天上午全体会议将在主厅举行。
全体人员出席的会议
All members are required to attend the plenary meeting after lunch.
所有成员午饭后须参加全体会议。
大会主题演讲
The conference opened with a plenary lecture by a leading scientist.
会议以一位著名科学家的主题演讲开幕。
全体会议发言人
The plenary speaker answered questions from the audience after the address.
全体会议发言人在演讲结束后回答了观众的提问。
绝对权力；全权
The constitution grants the president plenary power to command the military.
宪法授予总统指挥军队的绝对权力。
全大赦（天主教）
During the Jubilee, pilgrims can receive a plenary indulgence.
在禧年期间，朝圣者可以获得全大赦。
Use plenary naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
Plenary session 是“全体会议”：想象礼堂名额全满，没人缺席——全体出席。
语域：formal 常见场景：正式会议、正式文件 plenary 多用于正式场合，如全体会议（plenary session）或正式文件；日常口语中很少使用。
这些词与 plenary 共用拼写后缀 -ary，但都没有与之严格押韵（押韵要求重读元音及之后音素相同）。其中 ordinary 和 plenary 都以 /nəri/ 结尾，但重音元音不同；necessary、secretary、dictionary、stationary、canary 的发音也各不相同，注意不可按拼写类推。
Dictionary facts from ECDICT, WIKTIONARY.