Definition of "dividing line" []

• A conceptual separation or distinction (noun)

WordNet. Princeton University. 2010.

• "West of the dividing line lived tigers and monkeys, bears and orangutans, barbets and trogons; east of the line were friarbirds and cockatoos, birds of paradise and paradise kingfishers, cuscuses and other marsupials including farther east in New Guinea and tropical Australia the ineffable tree kangaroos, doing their clumsy best to fill niches left vacant by missing monkeys."
• "Freedman As Herself, the ten-year-old protagonist learns this while treading the dividing line between childhood and adolescence."
• "Bridged by a causeway, this creek was the dividing line of the allied army, with the American wing arrayed on the right, the French on the left."