- noun data transmitted over a number of data lines carrying all the bits of a data word simultaneously.
- The simultaneous transmission of bits, characters, or data units utilizing multiple lines, fibers, channels, or the like. For example, the use of eight wires to simultaneously transmit each of the eight bits of a byte. This contrasts with serial transmission, in which bits, characters, or data units are sent one at a time in sequence. Also called parallel data transmission.