ride•shar•ingPronunciation: (rīd'shâr"ing), [key]
of or pertaining to sharing rides or transportation, esp. among commuters: The agency was set up to devise a ridesharing program.
an act or instance of sharing rides or transportation, esp. by commuters: A statewide campaign to encourage ridesharing would reduce overcrowding on the highways.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.