1 : a printed circuit that can be inserted into expansion slots in a computer to increase the computer's capabilities
2 : computer circuit consisting of an electronic sub-assembly; copper conductors are laminated on an insulating board or card and circuit components are inserted into holes and dip soldered
3 : a plate mounted on the front and back of car and bearing the car's registration number
4 : a flat artifact that is thin relative to its length and width
5 : sheet of metal formed into a thin plate
6 : block consisting of a thick piece of something
