What does carpool mean?
Carpool refers to an arrangement in which several people — typically commuters or parents on a school run — travel together in a single vehicle, sharing fuel costs, parking fees, and sometimes driving duties. As a noun it names either the arrangement itself or the group taking part in it; as a verb, to carpool simply means to make journeys this way. The word is most at home in American English, where carpool lanes on busy highways reward vehicles carrying multiple occupants, though the practice and the term have spread internationally under related names such as ride-sharing or lift-sharing. Carrying no emotional charge of its own, the word nonetheless connotes practicality, thrift, and environmental awareness: joining a carpool reduces traffic congestion, cuts emissions per person, and saves money. For anyone writing about commuting, transport policy, or sustainable living, carpool is the standard, unambiguous term for shared routine travel by private car.
An arrangement in which a group of people travel regularly in one vehicle, sharing expenses and often alternating as driver; also the group itself.
"The company encourages staff to join a carpool through its subsidised parking scheme."
To travel to and from work, school, or another regular destination in a shared vehicle as part of such an arrangement.
"They carpool three days a week to save on petrol."
Inflected forms include carpools, carpoolled/carpooled, and carpooling.
The plural refers to multiple separate arrangements or groups.
"Several neighbourhood carpools operate along the same route."
In many US cities you can't drive in the fastest highway lane unless your car holds two or more people — which is exactly why 'carpool lane' became part of everyday American English.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of carpool
Carpool is a compound of car and pool, where pool derives from the French poule, meaning literally 'hen' but used figuratively from the seventeenth century onward for a collective stake in a game. That sense of pooling — combining resources into a common fund — gave English words like money pool and pool hall before being applied to shared transport in twentieth-century America, especially during the Second World War, when rationing of petrol encouraged commuters to share rides. The compound is thus a modern coinage built from older roots, with cognates in other pooled-resource expressions rather than in distant languages.
How carpool is actually used
As a noun, carpool is strongly associated with North American usage; British speakers are more likely to say lift-sharing or car-sharing scheme. The verb form is now common in both varieties. It is a neutral, practical word with no formal register.
Easily confused with carpool
Car share refers to renting or sharing access to a vehicle by the hour (as with services like Zipcar), while carpool means people travelling together in one vehicle on a regular journey.