1. (a unit of information equal to 1000 terabytes or 10^15 bytes) petabajt, PB synonim: petabyte2. (a unit of information equal to 1024 tebibytes or 2^50 bytes) petabajt, pebibajt, PB, PiB: : synonim: petabytesynonim: pebibytesynonim: PiB