1. A computer architecture in which, within a given multi-byte numeric representation, the most significant byte has the lowest address (the word is stored "big-end-first").
Most processors, including the IBM 370 family, the PDP-10, the Motorola microprocessor families, and most of the various RISC designs current in mid-1993, are big-endian.
By July 1994 this parochial idiosyncracy was on the way out and mailers started to reject big-endian addresses. By about 1996, people would look at you strangely if you suggested such a bizarre thing might ever have existed.