Home › Words › P › piagetianpiagetianpiagetian means of or relating to Jean Piaget (1896–1980), Swiss developmental psychologist and philosopher known for his cognitive studies with children.EtymologyFrom Piaget + -ian.adjOf or relating to Jean Piaget (1896–1980), Swiss developmental psychologist and philosopher known for his cognitive studies with children.e.g.“The Kohlbergian emergence of increasingly complex stages of moral development is built on the Piagetian emergence of increasingly complex logical operations.” — 2017, Robert Sapolsky, chapter 13, in Behave, Penguin, →ISBN:nounA proponent of Piaget's theories, esp. on children's cognitive development.Definitions & examples from Wiktionary (CC BY-SA 3.0).