'fixed-salary' originates from the combination of 'fixed,' meaning 'securely placed or fastened,' and 'salary,' which comes from Latin 'salarium,' originally meaning 'salt money' or 'payment for salt.'

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

Initially, 'salary' meant 'payment for salt,' but over time it evolved into its current meaning of 'regular payment for employment.'