reciprocality, reciprocity - a relation of mutual dependence or action or influence

commensalism - the relation between two different kinds of organisms when one receives benefits from the other without damaging it

parasitism - the relation between two different kinds of organisms in which one receives benefits from the other by causing damage to it (usually not fatal damage)

mutualism, symbiosis - the relation between two different species of organisms that are interdependent; each gains benefits from the other

sharing - having in common; "the sharing of electrons creates molecules"

sharing - using or enjoying something jointly with others