His method had the additional advantage that if they were to take a cab he was all ready to follow them.
Arthur Conan Doyle, The Hound of Baskervilles
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Dictionary
Merriam-Webster
— more than is usual or expected : ADDED
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Macmillan
— extra, and often more than expected
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Usage
1 use of ‘additional’ in The Hound of the Baskervilles, by Arthur Conan Doyle