O"ver*lay`(?), n. 1. A covering. Sir W. Scott.
(Printing) A piece of paper pasted upon the tympan sheet to improve the impression by making it stronger at a particular place.
(Computers) A subroutine which occupies a portion of main memory which is occupied at some other time by another subroutine during execution of the same program. Overlays were used as an older technique to allow larger programs to be executed in restricted main memory space; the same effect is now accomplished by different techniques.
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Sat 15th December 2018