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

'complementum' transformed into the French word 'complémentaire,' and eventually became the modern English word 'complimentary.'

Initially, it meant 'to complete or fill,' but over time it evolved into its current meanings of 'praising' and 'free of charge.'