'compliant' originates from the Latin word 'complere,' where 'com-' meant 'together' and 'plere' meant 'to fill.'

'complere' transformed into the Old French word 'complier,' and eventually became the modern English word 'compliant' through Middle English.

Initially, it meant 'to fill up or complete,' but over time it evolved into its current meaning of 'willing to comply.'