Definition: [noun] an overhead cost or expense.
Example: overheads, such as lighting, equipment, and any little extras, are paid for out of a centralized fund
Definition: [noun] a transparency designed for use with an overhead projector.
Example: software for producing slides, charts, and overheads
Definition: [noun] an overhead compartment, especially on an aircraft.
Example: passengers get up to fiddle with their luggage in the overheads