Definition of "carpool" [carpool]

• An arrangement whereby several participants or their children travel together in one vehicle, the participants sharing the costs and often taking turns as the driver. (noun)
• A group, as of commuters or parents, participating in a carpool. (noun)
• To travel in a carpool. (verb-intransitive)
• To transport by means of a carpool: carpool the children to school. (verb-transitive)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "There are multiple layers of issues that are triggered by the word 'carpool.'"
• "But a carpool is effectively a single-route transit system, which runs only once per day."
• "A carpool is customized single-route transit system."