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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

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
But the Collins Dictionary disagrees collinsdictionary.com/dictionary/english/scientifical – user107594 Jan 27 '15 at 9:12

Yeah, Scientifical is considered a real word, but it would be a lot less commonly used and you will receive odd looks. Acoustical is a more specific word than Acoustic, but can actually be used in the same sense.

Acoustic refers to things related to sound, as does Acoustical, but Acoustical also refers to things relating to Acoustic... Yes, that's definitely something sounding weird, but remember that Acoustic can refer to the science around sound, so Acoustical actually more specifically refers to things relating to the science around sound and is very Rarely used except in very specific instances, or else when Acoustic could have been used instead.

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Where's your evidence? – curiousdannii Sep 16 '15 at 10:57

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