'quadruplex' originates from Latin, specifically the word 'quadruplex', where 'quadru-' meant 'four' and '-plex' meant 'fold'.

'quadruplex' changed from the Latin word 'quadruplex' and eventually became the modern English word 'quadruplex'.

Initially, it meant 'fourfold', but over time it evolved into its current meaning of 'consisting of four parts or elements'.