Noun Singular Abbr: TiB 2^40 or 1,099,511,627,776 bytes. The tebibyte is a multiple of the unit byte for digital information. It is a member of the set of units with binary prefixes defined by the International Electrotechnical Commission (IEC). 1 tebibyte = 2^40 bytes = 1099511627776 bytes = 1024 gibibytes