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I know that they are interchangeable and mean nearly the same. But which of them has a stronger connotation in emphasizing the extent or importance more than the other? Or are they on the same level?

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Personally I think "signficiant" is a slightly stronger word. – Joachim Sauer Jun 29 '12 at 11:23
@Joachim: I agree with you, but I'm not so sure it's a considerable difference :^) – J.R. Jul 2 '12 at 0:12
up vote 4 down vote accepted

It depends on the context. In technical writing, we are very careful with our use of the word significant. We only use it when a number (some study result, for example) is statistically significant (with a certain p value, for example).

Even in nontechnical writing, though, I would say significant has a more technical, exact feel to it than considerable does. Considerable feels like a "guesstimate."

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