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Fair enough. The word "fitness" in a narrow biological sense is appropriate.

There's a common problem in science, that goes beyond evolutionary science, which is that scientists often use words in very specific ways that don't mean the same thing as the vernacular. You see this among some of the weird, New-Age "woo woo" interpretations of quantum mechanics, which are almost always predicated on the mistaken idea that our minds can affect the physical world at the quantum level. These silly notions almost always come from the fact that people hear the physicist talking about an "observer," and believe that the word "observer" means "person looking at something," when to a quantum physicist the word "observer" means "anything whose state depends in a thermodynamically irreversible way on the state of the thing with which it interacts."

So, yes, "survival of the fittest" is meaningful in the biological sense of the word "fittest," but not in the common vernacular sense of the word "fittest."

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