Having completed my studies there, I was duly attached to the Fifth Northumberland Fusiliers as Assistant Surgeon.
Arthur Conan Doyle, A Study In Scarlet
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Dictionary
Merriam-Webster
— one that is number five in a series
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Macmillan
— in the place or position counted as number 5
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Collins
— The fifth item in a series is the one that you count as number five.
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Usage
1 use of ‘fifth’ in A Study In Scarlet, by Arthur Conan Doyle