A playgroup is a social gathering of children, usually between the ages of two and five, and their parents or caregivers. The purpose of a playgroup is to provide an opportunity for children to interact with each other in a safe and supervised environment. The term 'playgroup' can also refer to a group of adults who meet regularly to engage in recreational activities. The crossword solution for the term 'playgroup' is CAST, which stands for Children and Adults Sharing Time.