Proprio vigore

PROPRIO VIGORE. By its own force or vigor. This expression is frequently used in construction. A phrase is said to have a certain meaning proprio vigore.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
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The presentation goes onto say, " If the answer to any of the questions set forth is in the affirmative, will the judgment apply proprio vigore to such licences that may be said to have been granted illegally?
He wrote for the court these reassuring words on the primacy of states' rights: "Our reasoning in Lloyd, however, does not ex proprio vigore limit the authority of the State to exercise its police power or its sovereign right to adopt in its own Constitution individual liberties more expansive than those conferred by the Federal Constitution."(13)