the.com/mutualism

means A relationship between two different species in which both partners benefit from the arrangement.

from Built from 'mutual' (shared, reciprocal), which traces back through French to the Latin 'mutuus' — meaning 'borrowed' or 'exchanged,' itself related to the Latin root for 'change,' mutare. The '-ism' tacked on turns a quality into a doctrine or system, as biologists did in the 1800s when they needed a word for partnerships like bees and flowers, or clownfish and anemones — relationships where nobody's getting used, everybody's getting paid.