vehicle

(noun) a conveyance that transports people or objects.

(noun) a medium for the expression or achievement of something. Examples: "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."

(noun) any substance that facilitates the use of a drug or pigment or other material that is mixed with it.

(noun) 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. Synonyms: fomite.