"Know, O enlightened Prince," said the Grand Vizier, "that until the year in which your exalted father began his salutary and unending reign, the land of Narnia was covered with ice and snow and was moreover ruled by a most powerful enchantress."
There are no more uses of "salutary" in the book.
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the salutary influence of mountain air
While advertising the drug’s salutary features, the company warns of possible side-effects.