(ecology) Any interaction between two species that benefits both; typically involves the exchange of substances or services.

Having the same relationship, each to each other. / Collective, done or held in common. / Reciprocal. / Possessed in common.

A mutual fund. / (business, finance, insurance) A mutual organization. / (Internet) Either of a pair of people who follow each other's social media accounts.

The property of being mutual.

plural of mutualization

The act or process of mutualizing.

plural of mutuality

(logic, probability theory) Describing multiple events or propositions such that the occurrence of any one implies the nonoccurrence of all other events or propositions.

(linguistics) Of two or more speech varieties, able to be understood by one another's speakers.

Alternative form of mutual assured destruction