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Definition of overhead
above the level of the head; in the sky:a helicopter buzzed overhead
1situated above the level of the head:the sun was directly overhead overhead power cables 2(of a driving mechanism) above the object driven:an overhead cam four-cylinder engine 3 [attributive] (of a cost or expense) incurred in the general upkeep or running of a plant, premises, or business, and not attributable to specific products or items.
1overhead cost or expense:research conducted in space requires more overhead 2a transparency designed for use with an overhead projector. 4an overhead compartment:the bag fits in most airline overheads