car park UK /ˈkɑːpɑːk/US /ˈkɑɹ ˌpɑːɹk/ noun3 •(Commonwealth, Ireland) An outdoor area or a building where cars may be parked.It is important also that we improve car park security. — 1998 •(Commonwealth, Australia) A rectangular section, usually marked by painted lines, designated for the parking of a single car. •(Commonwealth, figurative) A road with serious traffic congestion preventing the movement of vehicles. formscar parks