re: Define “five” without using the word “five” or another number

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Quintuple

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Fancy way of using “5” to define 5.

We can’t use numbers to define it!

Sure you name things with 5 parts, like a basketball team with 5 players or a hand with 5 fingers. But that’s an example of using 5 to describe something, not a definition for 5. “Blue” is not the sky, it’s a quality of the sky.