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In law, plenary typically refers to something that is full, complete, or absolute. It is often used to describe a full or comprehensive meeting or decision-making body. For example,plenary session is a meeting called by group leaders with the intention of having the entire group present. 

In the legal context, plenary power refers to complete or absolute power, especially when granted to a governing body or authority. Likewise, an individual with plenary authority over a project possesses absolute power and control over that project. 

[Last updated in February of 2024 by the Wex Definitions Team]