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Is there any substantive difference in the meanings of these two words? Is the latter considered a proper word at all?

If the answer to either of the above questions is yes, what are these words' differences in usage?

Similarly, "acoustic" versus "acoustical", etc.

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Related: Why is it geometric_ but theoretic_al_? –  RegDwigнt Apr 1 '11 at 10:16
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There is no such English word as "scientifical." You might make an argument that "acoustic" has the same meaning as "acoustical," though. Ain't English great?

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There is (or rather was) such a word. It's gone the way of the Dodo however. example –  Sam Apr 1 '11 at 13:45
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