Meaning of inclusive fitness

inclu'sive fit'ness

Pronunciation: [key]
— Biol. Biol.
  1. the fitness of an individual organism as measured in terms of the survival and reproductive success of its kin, each relative being valued according to the probability of shared genetic information, an offspring or sibling having a value of 50 percent and a cousin 25 percent.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.