Pronunciation: (kär'pOOl"),[key] —n.Also,car' pool". 1. Also,car'pool"ing,car' pool"ing.an arrangement among a group of automobile owners by which each owner in turn drives the others or their children to and from a designated place.
2. those included in such an arrangement.
—v.i. Also,car'-pool".to form or participate in a carpool.