'mutualistic' originates from the Latin word 'mutuus,' meaning 'borrowed or lent,' combined with the suffix '-istic,' indicating a characteristic or quality.

'Mutuus' transformed into the French word 'mutuel,' and eventually became the modern English word 'mutual' through Middle English, leading to 'mutualistic.'

Initially, it meant 'borrowed or lent,' but over time it evolved into its current meaning of 'characterized by mutual benefit.'