(computing) To modify core data from which other data is derived in such a way that the final meaning is unchanged.
(computing, transitive) To change the baseaddress of.
2006, Raymond Chen, The Old New Thing, When a DLL must be loaded at an address different from its preferred address (because the preferred address is unavailable), the kernel must rebase the DLL, which consists of updating (fixing up) all addresses in the DLL so that they refer to its new location in memory.