Wikipedia
Prelink
In computing prebinding, also called prelinking, is a method for speeding up a system by reducing the time a program needs to begin.
Prebinding is a method for reducing the time it takes to launch executables in the Mach-O file format. For example, Mac OS X does this in the "Optimizing" stage of installing system software or certain applications.
Prebinding looks up memory addresses of symbols in libraries that the program is using before the program is launched, and stores this information ahead-of-time, so that the computer need not look up (bind) addresses on each launch.