1. (a unit of information equal to 1000 terabytes or 10^15 bytes) petabyte, PB synonim: petabajt2. (a unit of information equal to 1024 tebibytes or 2^50 bytes) petabyte, pebibyte, PB, PiB: : synonim: petabajtsynonim: pebibajtsynonim: PiB