(1) A number that specifies the location of a single byte of memory. Addresses can be given as decimal integers or as hexadecimal integers. A 64K system has addresses ranging from 0 to 65535 (in decimal) or from $0000 to $FFFF (in hexadecimal). (2) In data transmission, a code for a specific terminal. Multiple terminals on one communication line, for example, must have unique addresses.