A parallel system refers to a separate and independent system that runs alongside another system, performing similar tasks simultaneously. These systems operate side by side without interfering with each other. Full definition
There are parallel systems of Western and traditional medicine and problems of coordination throughout. (fortune.com)
Talking and listening: Oral and written language are parallel systems for communicating meaning. (literacyconnections.com)
The hybrid system also uses a dual clutch system (one motor / two clutch parallel system) that efficiently manages power from both the electric motor and the gas engine. (thetorquereport.com)