Overhead

adv.	1.	Aloft; above; in or attached to the ceiling or roof; in the story or upon the floor above; in the zenith. While overhead the moon Sits arbitress. - Milton. Overhead engine a vertical steam engine in which the cylinder stands above the crank. Overhead work a general term in manufactories for countershafting and gearing, when overhead.
n.	1.	same as overhead expenses.
	2.	A compartment on a train, bus, or airplane used for storage of luggage or accessory equipment; called also overhead compartment.
	3.	(Sports) A stroke with a racket in which the ball is struck with the racket over the head, moving in a downward motion; also called overhead stroke.

Noun	1.	overhead - the expense of maintaining property (e.g., paying property taxes and utilities and insurance); it does not include depreciation or the cost of financing or income taxes Synonyms: budget items, operating cost, operating expense
	2.	overhead - (computer science) the processing time required by a device prior to the execution of a command Synonyms: command overhead, command processing overhead, command processing overhead time
	3.	overhead - (computer science) the disk space required for non-data information (used for location and timing) Synonyms: disk overhead
	4.	overhead - a transparency for use with an overhead projector Synonyms: viewgraph
	5.	overhead - (nautical) the top surface of an enclosed space on a ship
	6.	overhead - a hard return hitting the tennis ball above your head Synonyms: smash
Adj.	1.	overhead - located or originating from above; "an overhead crossing" Antonyms: subsurface - beneath the surface; "subsurface materials of the moon" surface - on the surface; "surface materials of the moon"
Adv.	1.	overhead - above your head; in the sky; "planes were flying overhead"
	2.	overhead - above the head; over the head; "bring the legs together overhead"

1.		overhead - Resources (in computing usually processing time or storage space) consumed for purposes which are incidental to, but necessary to, the main one. Overheads are usually quantifiable "costs" of some kind. Examples: The overheads in running a business include the cost of heating the building. Keeping a program running all the time eliminates the overhead of loading and initialising it for each transaction. Turning a subroutine into inline code eliminates the call and return time overhead for each execution but introduces space overheads.
2.	(communications)	overhead - information, such as control, routing, and error checking characters, that is transmitted along with the user data. It also includes information such as network status or operational instructions, network routing information, and retransmissions of user data received in error.
3.		overhead - Overhead transparencies or "slides" (usually 8-1/2" x 11") that are projected to an audience via an overhead (flatbed) projector.

abovestairs, airward, aloof, budget, budget items, burden of expenditure, carrying charge, ceiling, charges, cost, cost of living, cost-of-living allowance, cost-of-living index, costs, direct costs, disbursals, distributed costs, eaves, elevated, expenditures, expense, expense account, general expenses, high up, housetop, in the air, in the clouds, indirect costs, labor costs, lantern, liabilities, maintenance, material costs, on high, on stilts, on the peak, on tiptoe, operating costs, operating expense, outlay, over, overhead, penthouse, plafond, prime cost, raised, replacement cost, ridgepole, roof, roof garden, roof-deck, roofage, roofing, roofpole, rooftop, rooftree, shingles, skylight, skyward, slates, straight up, swindle sheet, tiles, tiptoe, to the zenith, top, unit cost, up, upper, upstairs, upward, upwards

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