Definition of kin selection
: a theory of natural selection which states that a usually altruistic behavior or attribute that lowers the fitness of a particular individual is selected for if it increases the probability of survival and reproduction of related kin who possess some or all of the same genes as the altruistic individual
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Merriam-Webster unabridged
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Time Traveler for kin selection
The first known use of kin selection was in 1975
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