What does the term "arbitrary number" mean in math?

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What does "arbitrary number" means in math? I've often seen this vocabulary but I can't find the meaning of it. For example, I'll see phrases like "arbitrary positive integer".

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Dictionary definition: based on random choice or personal whim, rather than any reason or system.

That's exactly what it means, even in the context of math.

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An arbitrary number is any number. Be it positive or negative.