An action performed by an official, corporate body, or public institution that exceeds the scope of legal authority or permissible authorization granted to them is classified as:
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Think of "Vires" as "Powers" (similar to vigor or strength):
- Ultra = Beyond $\rightarrow$ Ultra Vires = Beyond legal powers (Void).
- Intra = Within $\rightarrow$ Intra Vires = Within legal powers (Valid).
Step 1: Translation. Ultra vires = Latin for 'beyond powers.' An act is ultra vires when an authority exceeds its legal mandate. Its opposite is intra vires (within powers). Answer: Ultra vires