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overhead

   Also found in: Dictionary/thesaurus, Medical, Legal, Financial, Acronyms, Wikipedia, Hutchinson 0.03 sec.

(1) The amount of processing time used by system software, such as the operating system, TP monitor or database manager.

(2) In communications, the additional codes transmitted for control and error checking, which take more time to process.

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.
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"All right," said the other, and went up through the trapdoor; and I heard him step across the floor overhead and put down the hay.
Black Beauty by Sewell, Anna View in context
Then just overhead came a sound like an iron bedstead being knocked about, and the low angry growling of some large animal.
The Island of Doctor Moreau by Wells, H.G. View in context
As if to add to her troubles the night was now creeping on, and the gray clouds overhead changed to inky blackness.
Ozma of Oz by Baum, L. Frank View in context
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