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From The Free On-line Dictionary of Computing (05 January 2017) [foldoc]:
overhead
1. 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.