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The Free On-line Dictionary of Computing (foldoc)

/bit'blit/ [{BLT}] 1. Any of a family of closely related
algorithms for moving and copying rectangles of bits between
main and display memory on a {bit-mapped} device, or between
two areas of either main or display memory (the requirement to
do the {Right Thing} in the case of overlapping source and
destination rectangles is what makes BitBlt tricky).

2. {blit}, {BLT}.

[{Jargon File}]