vehicle in WordNet English dictionary

1. any inanimate object (as a towel or money or clothing or dishes or books or toys etc.) that can transmit infectious agents from one person to another
   fomite  vehicle 
   
2. a conveyance that transports people or objects
   vehicle 
   
3. a medium for the expression or achievement of something
   "his editorials provided a vehicle for his political views"; "a congregation is a vehicle of group identity"; "the play was just a vehicle to display her talents"
   vehicle 
   
4. any substance that facilitates the use of a drug or pigment or other material that is mixed with it
   vehicle