1
: a means of carrying or transporting something
planes, trains, and other vehicles
: such as
b
: a piece of mechanized equipment
2
: an agent of transmission : carrier
3
: a medium through which something is expressed, achieved, or displayed
an investment vehicle
especially
: a work created especially to display the talents of a particular performer
4a
: an inert medium (such as a syrup) in which a medicinally active agent is administered
b
: any of various media acting usually as solvents, carriers, or binders for active ingredients or pigments