(1):
(n.) One who is employed, or makes it his business, to carry goods for others for hire; a porter; a teamster.
(2):
(n.) One who, or that which, carries or conveys; a messenger.
(3):
(n.) That which drives or carries; as: (a) A piece which communicates to an object in a lathe the motion of the face plate; a lathe dog. (b) A spool holder or bobbin holder in a braiding machine. (c) A movable piece in magazine guns which transfers the cartridge to a position from which it can be thrust into the barrel.