Carpool/ˈkɑːrpuːl/ Definition 1 of 2Pro Tip 1/3Shared Responsibility Carpool implies shared duties like driving and planning routes among members. In our carpool, we rotate drivers every week. Pro Tip 2/3Eco-Friendly Option Carpooling is known to reduce pollution by decreasing the number of cars on the road. Taking a carpool is great for the environment. Pro Tip 3/3Social Interaction Carpool can be a social activity, allowing people to connect during their commute. I enjoy our morning chats in the carpool.