Definition
In evolutionary biology, your reproductive success score—measured not in gym visits but in viable offspring that survive to breed. That gaudy peacock's tail? Terrible for dodging predators, excellent for fitness, which explains why he has so many descendants despite being a walking target.
Example Usage
Biologists note that traits maximizing fitness often minimize immediate survival odds, explaining both the peacock and that viral video of someone backflipping into an empty pool.
Source: Darwin's evolutionary biology, now standard biological jargon
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See “fitness” in Corporate Speak, Gen-Z Slang, Pirate Speak, and more.
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