noun
The word 'fifth' can also be a noun, referring to one of five equal parts of a whole.
adjective
The word 'fifth' is an adjective that describes something that comes after the fourth in a series.
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The fifth chapter of the book discusses the impact of globalization on the economy.
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I'll meet you at the fifth street corner for lunch.
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Let's skip the first four levels and jump straight to the fifth.
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She always comes in fifth place in the race, but she never gives up trying.