Definition of "direct correlation" []

• A correlation in which large values of one variable are associated with large values of the other and small with small; the correlation coefficient is between 0 and +1 (noun)

WordNet. Princeton University. 2010.

• "During recent centuries, the rate of extinction has increased further and the range of jeopardy has widened—from birds to animals and plants of all kinds, and from islands to continents—as humanity’s impact has grown in direct correlation with the growth of human population, technological efficaciousness, and hubris."
• "The SilverSneakers sounds better than “Stale Shoes” Fitness Program, exclusively for seniors, has expanded to twelve hundred gyms and YMCAs across the country as people increasingly recognize the direct correlation between exercising and staying young."