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A word means what it's user meant when they used the word.
Many, many words have multiple definitions, sometimes those definitions are antonyms. Words are not a consistent system. Especially not English words.
 Originally Posted by OngBonga
An example when it comes to science is conformal cyclic cosmology, which myself and mojo have been discussing in the physics thread. This is pure theory, which is an important phrase in itself. It demonstrates that the word "theory", even in a scientific context, does not mean "a hypothesis backed up by evidence". If I argue that the universe started two weeks ago, that's a theory, even if it's complete and utter bollocks and can be proven so.
No. CCC is a hypothesis, not a theory... in scientific terms.
The theory of General Relativity is a theory because after Einstein proposed the hypothesis, it has been widely tested by numerous independent researchers using a wide range of methods, and exactly none of those tests showed that hypothesis to be false.
Scientifically, a theory is as close to fact as we have. In science, theory and Law are basically the same. A theory may be composed of multiple laws, or a theory may be a single law.
Colloquially, it's a very different matter. Colloquially, a theory and a hypothesis or a (subjectively) well-thought-out opinion are the same things. If someone says, "I have this theory about XXX," that's not a scientific opinion, not a well-tested and established proposal... it's a guess. Maybe a good guess, maybe a bad guess. Just a guess, though.
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