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overlay

   Also found in: Dictionary/thesaurus, Acronyms, Encyclopedia, Wikipedia, Hutchinson 0.01 sec.
overlay,
n See onlay.
overlay, computer,
n a technique for bringing routines into memory from magnetic storage during processing so that several routines will occupy the same storage locations at different times. Overlay techniques are used when the total storage requirements for instructions exceed the available storage in memory.
overlay
a later component superimposed on a pre-existing state or condition.
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