1. (a unit of information equal to 1000 exabytes or 10^21 bytes) zettabajt, ZB synonim: zettabyte2. (a unit of information equal to 1024 exbibytes or 2^70 bytes) zettabajt, ZB, zebibajt, ZiB: : synonim: zettabytesynonim: zebibytesynonim: ZiB