1. (a unit of information equal to 1000 exabytes or 10^21 bytes) zettabyte, ZB synonim: ZB2. (a unit of information equal to 1024 exbibytes or 2^70 bytes) zettabyte, zebibyte, ZB, ZiB: : synonim: ZBsynonim: zebibajtsynonim: ZiB